Stockholders' Equity (Deficit) - Additional Information (Detail)

v3.7.0.1

Stockholders' Equity (Deficit) - Additional Information (Detail)						1 Months Ended					3 Months Ended			6 Months Ended
	May 17, 2017 USD ($) $ / shares shares	Apr. 30, 2017 USD ($) shares	Apr. 20, 2017	Mar. 31, 2017 USD ($) $ / shares shares	Jan. 04, 2017 USD ($) shares	May 31, 2017 USD ($) $ / shares shares	Apr. 30, 2017 shares	Mar. 31, 2017 USD ($) $ / shares shares	Nov. 30, 2016 USD ($) $ / shares shares	Aug. 31, 2016 $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	May 16, 2017 shares	Dec. 31, 2016 $ / shares shares
Class of Stock [Line Items]
Reverse stock split ratio			0.6
Stockholders' equity, reverse stock split			0.6-for-1.0
Common stock, shares authorized		38,500,000				75,000,000	38,500,000				75,000,000			75,000,000			38,500,000
Common stock, par value | $ / shares						$ 0.001					$ 0.001			$ 0.001			$ 0.001
Common stock shares issued														12,335,265
Stock issued during period, shares, exercise of stock options														1,580
Warrants maturity period														4 years
Issuance of warrants to purchase common stock | $														$ 8,658,000
Outstanding warrants											1,277,157			1,277,157
Share based lump sum payment | $					$ 350,000
Repurchase of common stock					7,500
Payment of buyback of common stock | $					$ 56,000									$ 56,000
Stock-based compensation expense | $											$ 1,778,000		$ 1,481,000	$ 1,903,000	$ 1,522,000
Expected forfeitures rate											10.00%
Chief Executive Officer [Member]
Class of Stock [Line Items]
Common stock shares issued														10,121
Common stock granted											10,121
Bridge Loan [Member]
Class of Stock [Line Items]
Common stock shares issued								90,000
Borrowing under line of credit | $								$ 2,000,000
Shares converted to common stock														590,717
First Loans [Member]
Class of Stock [Line Items]
Issuance of warrants to purchase common stock | $														$ 700,000
Second Loans [Member]
Class of Stock [Line Items]
Warrants maturity period									4 years
Issuance of warrants to purchase common stock | $									$ 700,000
Issuance of warrants to purchase common stock									2
Acacia [Member]
Class of Stock [Line Items]
Common stock shares issued								120,000
Acacia [Member] | Bridge Loan [Member]
Class of Stock [Line Items]
Common stock shares issued												180,000
Borrowing under line of credit | $		$ 2,000,000						$ 2,000,000				$ 4,000,000
Shares converted to common stock				590,717
Warrants maturity period		10 years
Acacia [Member] | Convertible Notes Payable [Member]
Class of Stock [Line Items]
Shares converted to common stock	1,523,746									1,523,746				1,523,746
Warrants maturity period										5 years
Warrant exercise price | $ / shares										$ 13.6088
Acacia [Member] | First Loans [Member]
Class of Stock [Line Items]
Warrants maturity period														4 years
Issuance of warrants to purchase common stock | $														$ 700,000
Acacia [Member] | Second Loans [Member]
Class of Stock [Line Items]
Warrants maturity period									4 years
Issuance of warrants to purchase common stock									700,000					1,277,157
Outstanding warrants											1,277,157			1,277,157
Acacia [Member] | Primary Warrant [Member]
Class of Stock [Line Items]
Issuance of stock due to warrants exercise	2,150,335			2,150,335				2,150,335			2,150,335	2,150,335		2,150,335
VLOC, LLC [Member] | Bridge Loan [Member]
Class of Stock [Line Items]
Common stock shares issued						90,000
Borrowing under line of credit | $						$ 4,000,000
Series B Redeemable Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Shares converted to common stock	2,309,135													2,309,135
Series A Redeemable Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Shares converted to common stock	2,922,798													2,922,798
Maximum [Member] | First Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares											$ 13.7323			$ 13.7323
Maximum [Member] | Second Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares									$ 13.7323
Maximum [Member] | Acacia [Member] | Convertible Notes Payable [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares				$ 13.6088				$ 13.6088				$ 13.6088
Maximum [Member] | Acacia [Member] | First Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares											13.7323			13.7323
Maximum [Member] | Acacia [Member] | Second Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares									13.7323
Maximum [Member] | Acacia [Member] | Primary Warrant [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares				13.7323				13.7323				13.7323
Minimum [Member] | First Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares											8.0833			8.0833
Minimum [Member] | Second Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares									8.0833
Minimum [Member] | Acacia [Member] | First Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares											$ 8.0833			$ 8.0833
Minimum [Member] | Acacia [Member] | Second Loans [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares									$ 8.0833
Minimum [Member] | Acacia [Member] | Primary Warrant [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares				13.3028				$ 13.3028				13.3028
Initial Public Offering [Member]
Class of Stock [Line Items]
Common stock shares issued	2,500,000													2,500,000
Warrants maturity period	5 years							5 years
Warrant exercise price | $ / shares				$ 13.6088				$ 13.6088				$ 13.6088
Outstanding warrants	809,400			809,400				809,400				809,400
IPO completion date								May 17, 2017
Percentage of warrant exercise	10.00%							10.00%
Initial Public Offering [Member] | Vested Upon Issuance [Member]
Class of Stock [Line Items]
Warrant vesting percentage	50.00%							50.00%
Initial Public Offering [Member] | Vest in May 2018 [Member]
Class of Stock [Line Items]
Warrant vesting percentage	50.00%
Initial Public Offering [Member] | Convertible Notes Payable [Member]
Class of Stock [Line Items]
Outstanding warrants	154,311			154,311				154,311				154,311
Initial Public Offering [Member] | Amended Primary Warrant [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares				$ 13.6088				$ 13.6088				$ 13.6088
Initial Public Offering [Member] | Acacia [Member]
Class of Stock [Line Items]
Warrants maturity period	5 years					5 years
Warrant exercise price | $ / shares	$ 13.6088
Outstanding warrants	809,400					809,400
Percentage of warrant exercise	10.00%					10.00%
Initial Public Offering [Member] | Acacia [Member] | Vested Upon Issuance [Member]
Class of Stock [Line Items]
Warrant vesting percentage	50.00%
Initial Public Offering [Member] | Acacia [Member] | Amended Primary Warrant [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares				$ 13.6088				$ 13.6088				$ 13.6088
Initial Public Offering [Member] | Maximum [Member]
Class of Stock [Line Items]
Outstanding warrants	51,437			51,437				51,437				51,437
Consultants [Member]
Class of Stock [Line Items]
Issuance of restricted stock, shares														17,333
VLOC, LLC [Member]
Class of Stock [Line Items]
Outstanding warrants											313,446			313,446
VLOC, LLC [Member] | Bridge Loan [Member]
Class of Stock [Line Items]
Warrants maturity period	10 years													10 years
Warrant exercise price | $ / shares	$ 13.6088										$ 13.6088			$ 13.6088
Outstanding warrants	313,446										313,446			313,446
2014 Stock Option/Stock Issuance Plan [Member]
Class of Stock [Line Items]
Issuance of restricted stock, shares														9,500
Stock issued during period, shares, exercise of stock options														1,580
Common stock reserved for future issuance		900,000					900,000
Increase in common stock reserved for future issuance		4,450,585					4,450,585
Options Granted														3,801,158
Options exercise price | $ / shares														$ 15.00
Options exercise price | $ / shares														$ 1.93
Unrecognized compensation expense related to stock options | $											$ 33,114,000			$ 33,114,000
2014 Stock Option/Stock Issuance Plan [Member] | Employees And Directors [Member]
Class of Stock [Line Items]
Options Granted											666,702
Options exercise price | $ / shares											$ 15.00
Vesting period											4 years
2017 Stock Incentive Plan [Member]
Class of Stock [Line Items]
Common stock reserved for future issuance		2,000,000					2,000,000
Annual shares increase for future issuance by percentage under employee stock purchase plans							3.00%
2017 Stock Incentive Plan [Member] | Maximum [Member]
Class of Stock [Line Items]
Increase in common stock reserved for future issuance		750,000					750,000
Employee Stock Purchase Plan [Member]
Class of Stock [Line Items]
Common stock reserved for future issuance		1,000,000					1,000,000
Annual shares increase for future issuance by percentage under employee stock purchase plans							1.00%
Maximum number of shares per employee in each purchase							1,000
Common stock granted														0
Employee Stock Purchase Plan [Member] | Maximum [Member]
Class of Stock [Line Items]
Increase in common stock reserved for future issuance		250,000					250,000
Employee Stock Purchase Plan [Member] | Minimum [Member]
Class of Stock [Line Items]
Percentage of purchase price of common stock fair value							85.00%
Note Purchase Agreement [Member]
Class of Stock [Line Items]
Common stock shares issued								120,000
Note Purchase Agreement [Member] | VLOC, LLC [Member]
Class of Stock [Line Items]
Common stock shares issued								120,000
Warrants maturity period												10 years
Note Purchase Agreement [Member] | VLOC, LLC [Member] | Bridge Loan [Member]
Class of Stock [Line Items]
Borrowing under line of credit | $	$ 4,000,000
Shares converted to common stock	590,717
Issuance of warrants to purchase common stock | $	$ 1,770,000
Outstanding warrants	313,446															240,000
Note Purchase Agreement [Member] | VLOC, LLC [Member] | Acacia [Member] | Bridge Loan [Member]
Class of Stock [Line Items]
Borrowing under line of credit | $		$ 2,000,000				$ 4,000,000		$ 2,000,000
Note Purchase Agreement [Member] | VLOC, LLC [Member] | Maximum [Member]
Class of Stock [Line Items]
Warrant exercise price | $ / shares	$ 13.6088
Restricted Stock [Member]
Class of Stock [Line Items]
Stock-based compensation expense | $											$ 375,000		28,000	$ 451,000	48,000
Restricted Stock [Member] | 2014 Stock Option/Stock Issuance Plan [Member]
Class of Stock [Line Items]
Vesting period														4 years
Restricted stock units granted														52,433
Unrecognized cost of share-based compensation awards | $											1,088,000			$ 1,088,000
Cost of share-based compensation awards, recognition period														2 years 8 months 12 days
Stock Options [Member]
Class of Stock [Line Items]
Stock-based compensation expense | $											$ 1,278,000		$ 1,453,000	$ 1,327,000	$ 1,474,000
Stock Options [Member] | 2014 Stock Option/Stock Issuance Plan [Member]
Class of Stock [Line Items]
Vesting period														4 years
Cost of share-based compensation awards, recognition period														2 years 3 months 19 days
Expiration period														10 years
Restricted Stock Units [Member] | 2017 Stock Incentive Plan [Member] | Directors [Member]
Class of Stock [Line Items]
Common stock reserved for future issuance											1,964,424			1,964,424
Restricted stock units granted											35,576
Options exercise price | $ / shares											$ 14.76
Time-based Stock Option [Member] | Chad Steelberg and Ryan Steelberg [Member]
Class of Stock [Line Items]
Options Granted											2,089,638			2,089,638
Options exercise price | $ / shares											$ 15.00
Vesting period								3 years			3 years
Annual shares increase for future issuance by percentage under employee stock purchase plans								5.00%
Performance- based Stock Option [Member] | Chad Steelberg and Ryan Steelberg [Member]
Class of Stock [Line Items]
Options Granted											1,044,818			1,044,818
Options exercise price | $ / shares											$ 15.00
Vesting period								5 years			5 years
Vesting rights description											The performance-based stock option would vest upon the earlier of (a) the first date on which the market capitalization of the Company's common stock equals or exceeds $400,000 over five consecutive business days, or (b) five years after the IPO			The performance-based stock option would vest upon the earlier of (a) the first date on which the market capitalization of the Company's common stock equals or exceeds $400,000 over five consecutive business days, or (b) five years after the IPO.
Vesting rights, market capitalization | $				$ 400,000,000				$ 400,000,000			$ 400,000,000	$ 400,000,000		$ 400,000,000
Vesting rights, consecutive trading days								5 days			5 days
Annual shares increase for future issuance by percentage under employee stock purchase plans								2.50%