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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ (DEFICIT) EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Stock Issued During Period, Shares, Conversion of Convertible Securities |  | 10,643 |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities |  | $ 6 | $ 1,736 |  |
Adjustments to Additional Paid in Capital, Preferred Stock Warrant Conversion, Common Stock Warrant | $ 196,594 |  | 196,588 |  |
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants |  | $ 0 |  |  |
Beginning balance (in shares) at Dec. 31, 2017 |  | 3,439 |  |  |
Beginning balance at Dec. 31, 2017 | (208,686) | $ 0 | 58,693 | $ 1,066 | $ (268,445)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 329 |  |  |
Exercise of common stock options | $ 1,799 |  | $ 1,799 |  |
Stock Issued During Period, Shares, Warrants Exercised In Period | 0 | 1,142 | 0 |  |
Stock-based compensation |  |  | $ 16,968 |  |
Settlement of restricted stock (in shares) |  | 0 |  |  |
Vesting of common stock warrants | $ 16,968 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 37 |  |  |
Stock Issued During Period, Value, New Issues | 66,101 | $ 1 | 66,100 |  |
Stock Issued During Period, Shares, New Issues |  | 5,821 |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | $ 0 | 0 |  |
Accretion of redeemable convertible preferred stock to redemption value |  |  | (157) |  |
Preferred Stock, Accretion of Redemption Discount | (157) |  |  | 0 |
Other comprehensive income | 574 |  |  | 574 |
Net loss | (41,476) |  |  |  | (41,476)
Ending balance (in shares) at Sep. 30, 2018 |  | 21,411 |  |  |
Ending balance at Sep. 30, 2018 | 51,227 | $ 7 | 359,501 | 1,640 | (309,921)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature | 17,774 |  |  |  |
Beginning balance (in shares) at Jun. 30, 2018 |  | 20,316 |  |  |
Beginning balance at Jun. 30, 2018 | 36,766 | $ 7 | 336,874 | 1,438 | (301,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 265 |  |  |
Exercise of common stock options | 1,655 |  | 1,655 |  |
Stock-based compensation |  |  | 0 |  |
Settlement of restricted stock (in shares) |  | 37 |  |  |
Vesting of common stock warrants | 15,255 | $ 793 | 15,255 |  |
Stock Issued During Period, Value, New Issues | 5,717 | $ 0 | 5,717 |  |
Other comprehensive income | 202 |  |  | 202 |
Net loss | (8,368) |  |  |  | (8,368)
Ending balance (in shares) at Sep. 30, 2018 |  | 21,411 |  |  |
Ending balance at Sep. 30, 2018 | 51,227 | $ 7 | 359,501 | 1,640 | (309,921)
Beginning balance (in shares) at Dec. 31, 2018 |  | 22,466 |  |  |
Beginning balance at Dec. 31, 2018 | $ 51,975 | $ 7 | 371,463 | 1,992 | (321,487)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) | 215 | 215 |  |  |
Exercise of common stock options | $ 2,850 |  | $ 2,850 |  |
Stock Issued During Period, Shares, Warrants Exercised In Period | 17,659 | 821 | 17,659 |  |
Stock-based compensation | $ 12,292 |  | $ 12,292 |  |
Settlement of restricted stock (in shares) |  | 164 |  |  |
Stock Issued During Period, Value, New Issues | 61,309 | $ 1 | 61,308 |  |
Stock Issued During Period, Shares, New Issues |  | 1,904 |  |  |
Other comprehensive income | 642 |  |  | 642 |
Net loss | (20,571) |  |  |  | (20,571)
Ending balance (in shares) at Sep. 30, 2019 |  | 25,664 |  |  |
Ending balance at Sep. 30, 2019 | 127,321 | $ 8 | 466,737 | 2,634 | (342,058)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | (1,165) | $ (94) | (1,165) |  |
Beginning balance (in shares) at Jun. 30, 2019 |  | 22,828 |  |  |
Beginning balance at Jun. 30, 2019 | 46,538 | $ 7 | 378,773 | 2,069 | (334,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 104 |  |  |
Exercise of common stock options | $ 1,502 |  | $ 1,502 |  |
Stock Issued During Period, Shares, Warrants Exercised In Period | 17,659 | 821 | 17,659 |  |
Stock-based compensation | $ 7,495 |  | $ 7,495 |  |
Settlement of restricted stock (in shares) |  | 7 |  |  |
Stock Issued During Period, Value, New Issues | 61,309 | $ 1 | 61,308 |  |
Stock Issued During Period, Shares, New Issues |  | 1,904 |  |  |
Other comprehensive income | 565 |  |  | 565 |
Net loss | (7,747) |  |  |  | (7,747)
Ending balance (in shares) at Sep. 30, 2019 |  | 25,664 |  |  |
Ending balance at Sep. 30, 2019 | $ 127,321 | $ 8 | $ 466,737 | $ 2,634 | $ (342,058)

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