Consolidated Statement of Stockholders' Equity (Deficit) - USD ($) $ in Thousands |
Total |
Dissenting stockholder [Member] |
Initial Public Offering [Member] |
Bridge Loan [Member] |
Bridge Loan [Member]
Initial Public Offering [Member]
|
Series B Redeemable Convertible Preferred Stock [Member] |
Series B Redeemable Convertible Preferred Stock [Member]
Initial Public Offering [Member]
|
Series A Redeemable Convertible Preferred Stock [Member] |
Series A Redeemable Convertible Preferred Stock [Member]
Initial Public Offering [Member]
|
Conversion of Convertible Note Payable [Member]
Initial Public Offering [Member]
|
Common Stock [Member] |
Common Stock [Member]
Dissenting stockholder [Member]
|
Common Stock [Member]
Initial Public Offering [Member]
|
Common Stock [Member]
Bridge Loan [Member]
|
Common Stock [Member]
Bridge Loan [Member]
Initial Public Offering [Member]
|
Common Stock [Member]
Series B Redeemable Convertible Preferred Stock [Member]
Initial Public Offering [Member]
|
Common Stock [Member]
Series A Redeemable Convertible Preferred Stock [Member]
Initial Public Offering [Member]
|
Common Stock [Member]
Conversion of Convertible Note Payable [Member]
Initial Public Offering [Member]
|
Additional Paid-in Capital [Member] |
Additional Paid-in Capital [Member]
Dissenting stockholder [Member]
|
Additional Paid-in Capital [Member]
Initial Public Offering [Member]
|
Additional Paid-in Capital [Member]
Bridge Loan [Member]
|
Additional Paid-in Capital [Member]
Bridge Loan [Member]
Initial Public Offering [Member]
|
Additional Paid-in Capital [Member]
Series B Redeemable Convertible Preferred Stock [Member]
Initial Public Offering [Member]
|
Additional Paid-in Capital [Member]
Series A Redeemable Convertible Preferred Stock [Member]
Initial Public Offering [Member]
|
Additional Paid-in Capital [Member]
Conversion of Convertible Note Payable [Member]
Initial Public Offering [Member]
|
Accumulated Other Comprehensive Loss [Member] |
Accumulated Deficit [Member] |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Beginning balance at Dec. 31, 2014 | $ (9,375) | $ 3 | $ (4,654) | $ (4,724) | ||||||||||||||||||||||||
Beginning balance, shares at Dec. 31, 2014 | 1,839,191 | |||||||||||||||||||||||||||
Buy-back/Repurchase of common stock | (790) | $ (1) | (789) | |||||||||||||||||||||||||
Buy-back/Repurchase of common stock, shares | (525,591) | |||||||||||||||||||||||||||
Stock-based compensation expense | 127 | 127 | ||||||||||||||||||||||||||
Forfeiture of restricted stock, net | 0 | $ 0 | 0 | $ 0 | 0 | |||||||||||||||||||||||
Forfeiture of restricted stock, shares | (12,351) | |||||||||||||||||||||||||||
Accretion of redeemable convertible preferred stock | (3,330) | (3,330) | ||||||||||||||||||||||||||
Net loss | (6,210) | (6,210) | ||||||||||||||||||||||||||
Ending balance at Dec. 31, 2015 | (19,578) | $ 2 | (4,527) | (15,053) | ||||||||||||||||||||||||
Ending balance, shares at Dec. 31, 2015 | 1,301,249 | |||||||||||||||||||||||||||
Issuance of common stock | $ 159 | $ 159 | ||||||||||||||||||||||||||
Issuance of common stock, shares | 106,420 | |||||||||||||||||||||||||||
Issuance of restricted stock, net of forfeitures | 0 | $ 0 | 0 | 0 | 0 | |||||||||||||||||||||||
Issuance of restricted stock, net of forfeitures, shares | 199,795 | |||||||||||||||||||||||||||
Exercise of options | 77 | 77 | ||||||||||||||||||||||||||
Exercise of options, shares | 51,504 | |||||||||||||||||||||||||||
Issuance of warrants | 458 | 458 | ||||||||||||||||||||||||||
Beneficial conversion feature | 1,812 | 1,812 | ||||||||||||||||||||||||||
Stock-based compensation expense | 1,730 | $ 2 | 1,728 | |||||||||||||||||||||||||
Stock-based compensation expense, shares | 961,835 | |||||||||||||||||||||||||||
Accretion of redeemable convertible preferred stock | (3,204) | (3,204) | ||||||||||||||||||||||||||
Net loss | (26,979) | (26,979) | ||||||||||||||||||||||||||
Ending balance at Dec. 31, 2016 | $ (45,525) | $ 4 | (293) | (45,236) | ||||||||||||||||||||||||
Ending balance, shares at Dec. 31, 2016 | 2,620,803 | |||||||||||||||||||||||||||
Issuance of common stock | $ 32,580 | $ 3,666 | $ 3 | $ 0 | $ 32,577 | $ 3,666 | ||||||||||||||||||||||
Issuance of common stock, shares | 12,335,519 | 2,500,000 | 2,500,000 | 300,000 | ||||||||||||||||||||||||
Conversion of preferred stock upon public offering | $ 18,668 | $ 8,598 | $ 2 | $ 3 | $ 18,666 | $ 8,595 | ||||||||||||||||||||||
Conversion of preferred stock upon public offering, shares | 2,309,135 | 2,922,798 | 2,309,135 | 2,922,798 | ||||||||||||||||||||||||
Exercise of Primary Warrant upon public offering | $ 29,263 | $ 2 | $ 29,261 | |||||||||||||||||||||||||
Exercise of Primary Warrant upon public offering, shares | 2,150,335 | |||||||||||||||||||||||||||
Conversion of debt and accrued interest upon public offering | $ 8,045 | $ 20,737 | $ 1 | $ 2 | $ 8,044 | $ 20,735 | ||||||||||||||||||||||
Conversion of debt and accrued interest upon public offering, shares | 590,717 | 590,717 | 1,523,746 | |||||||||||||||||||||||||
Issuance of restricted stock, net of forfeitures | $ 0 | $ 0 | 0 | 0 | 0 | |||||||||||||||||||||||
Issuance of restricted stock, net of forfeitures, shares | 30,415 | |||||||||||||||||||||||||||
Buy-back/Repurchase of common stock | $ (56) | $ 0 | (56) | |||||||||||||||||||||||||
Buy-back/Repurchase of common stock, shares | (7,500) | (7,500) | ||||||||||||||||||||||||||
Exercise of options | $ 5 | $ (2) | 7 | |||||||||||||||||||||||||
Exercise of options, shares | 3,281 | 3,281 | ||||||||||||||||||||||||||
Issuance of warrants | $ 8,658 | 8,658 | ||||||||||||||||||||||||||
Beneficial conversion feature | 554 | 554 | ||||||||||||||||||||||||||
Modification of warrants | 371 | 371 | ||||||||||||||||||||||||||
Stock-based compensation expense | 13,611 | $ 0 | 13,611 | |||||||||||||||||||||||||
Stock-based compensation expense, shares | 12,592 | |||||||||||||||||||||||||||
Accretion of redeemable convertible preferred stock | (4,470) | (4,470) | ||||||||||||||||||||||||||
Net loss | (46,811) | (46,811) | ||||||||||||||||||||||||||
Other comprehensive loss | (62) | (62) | ||||||||||||||||||||||||||
Ending balance at Sep. 30, 2017 | $ 47,832 | $ 15 | $ 144,396 | $ (62) | $ (96,517) | |||||||||||||||||||||||
Ending balance, shares at Sep. 30, 2017 | 14,956,322 |