Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Stockholders' Equity (Deficit) - Additional Information (Detail)
1 Months Ended 12 Months Ended
Nov. 21, 2017
$ / shares
shares
May 17, 2017
$ / shares
shares
Apr. 30, 2017
USD ($)
$ / shares
shares
Apr. 20, 2017
Jan. 04, 2017
USD ($)
shares
Nov. 30, 2017
shares
May 31, 2017
USD ($)
$ / shares
shares
Apr. 30, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Apr. 30, 2016
$ / shares
shares
Jul. 31, 2014
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
May 16, 2017
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 38,500,000  
Common stock, par value | $ / shares             $ 0.001         $ 0.001 $ 0.001  
Common stock shares issued                       13,538,080    
Repurchase of common stock         7,500             7,500    
Share based lump sum payment | $         $ 350,000                  
Payment of buyback of common stock | $         $ 56,000                  
Issuance of warrants to purchase common stock                       1,122,840 2,552,068  
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    
Warrants outstanding   313,440                       240,000
Dissenting stockholder [Member]                            
Class of Stock [Line Items]                            
Payments for estimated taxes and reimbursement of certain legal fees for the shares | $               $ 287,000            
Acacia [Member]                            
Class of Stock [Line Items]                            
Warrants outstanding                       1,524,573    
Acacia [Member] | Bridge Loan [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued   180,000                        
Borrowing under line of credit | $     $ 2,000,000       $ 4,000,000              
Acacia [Member] | Convertible Notes Payable [Member]                            
Class of Stock [Line Items]                            
Shares converted to common stock   1,523,746                   1,523,746    
Issuance of warrants to purchase common stock                         3  
Acacia [Member] | Primary Warrant [Member]                            
Class of Stock [Line Items]                            
Issuance of stock due to warrants exercise   2,150,335                   2,150,335    
Warrants outstanding   809,400                        
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]                            
Common stock shares issued                     3,092,781      
Shares converted to common stock   2,309,135                   2,309,135    
Share price | $ / shares                     $ 4.85      
Series A Redeemable Convertible Preferred Stock [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued                     3,000,000      
Shares converted to common stock   2,922,798                   2,922,798    
Share price | $ / shares                       $ 1.76    
Initial Public Offering [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued   2,500,000                   2,500,000    
Share price | $ / shares   $ 15                        
Initial Public Offering [Member] | Acacia [Member] | Convertible Notes Payable [Member]                            
Class of Stock [Line Items]                            
Shares converted to common stock   1,523,746                        
Follow On Public Offering [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued 1,121,250         1,121,250                
Share price | $ / shares $ 23                          
Note Purchase Agreement [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued                 120,000          
Common Stock [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued                         106,420  
Repurchase of common stock                       7,500    
Common Stock [Member] | Bridge Loan [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued                       300,000    
Shares converted to common stock                       590,717    
Common Stock [Member] | Chad Steelberg and Ryan Steelberg [Member]                            
Class of Stock [Line Items]                            
Stock issued               961,835   961,835        
Share price | $ / shares     $ 1.50         $ 1.50   $ 1.50        
Service period               4 months            
Stock-based compensation expense | $                         $ 1,443,000  
Common Stock [Member] | Dissenting stockholder [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued               106,420       3,621,250    
Common Stock [Member] | Series B Redeemable Convertible Preferred Stock [Member]                            
Class of Stock [Line Items]                            
Shares converted to common stock                       2,309,135    
Common Stock [Member] | Series A Redeemable Convertible Preferred Stock [Member]                            
Class of Stock [Line Items]                            
Shares converted to common stock                       2,922,798    
Restricted Stock [Member]                            
Class of Stock [Line Items]                            
Number of shares of restricted common stock forfeited                       22,243    
Shares, Vested                       1,227    
Common Stock Awards [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued                       145,069    
General and Administrative [Member]                            
Class of Stock [Line Items]                            
Settlement expense | $                         $ 294  
General and Administrative [Member] | Dissenting stockholder [Member]                            
Class of Stock [Line Items]                            
Stock-based compensation expense | $               $ 159,000            
Consultants [Member]                            
Class of Stock [Line Items]                            
Common stock shares issued                       6,000