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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Restricted Stock Units (RSUs) [Member] Preferred Stock [Member] Convertible Preferred Stock [Member] | Restricted Stock Units (RSUs) [Member] Common Stock [Member] | Preferred Stock [Member] Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2015 |  |  | 110,500,514 | 1,578,962 |  |  |
Balance at Dec. 31, 2015 |  |  | $ 46,030 | $ 2 | $ 358 | $ (49,832) | $ (3,442)
Exchange of convertible preferred stock warrants to common stock (in shares) |  |  |  | 10,807 |  |  |
Exchange of convertible preferred stock warrants to common stock |  |  |  |  | 25 |  | 25
Reclassification of convertible shareholder notes derivative liability |  |  |  |  | 2,268 |  | 2,268
Conversion of convertible notes into common stock (in shares) |  |  |  | 8,091,103 |  |  |
Conversion of convertible notes into common stock |  |  |  | $ 8 | 12,148 |  | 12,156
Conversion of preferred stock into common stock (in shares) |  |  | (110,500,514) | 9,208,376 |  |  |
Conversion of preferred stock into common stock |  |  | $ (46,030) | $ 9 | 46,021 |  |
Issuance of common stock upon reverse merger (in shares) |  |  |  | 19,228,595 |  |  |
Issuance of common stock upon reverse merger |  |  |  | $ 19 | 18,902 |  | 18,921
Exercise of stock options (in shares) |  |  |  | 13,460 |  |  |
Exercise of stock options |  |  |  |  | 22 |  | 22
Share-based compensation |  |  |  |  | 942 |  | 942
Net loss |  |  |  |  |  | (10,310) | (10,310)
Balance (in shares) at Dec. 31, 2016 |  |  |  | 38,131,303 |  |  |
Balance at Dec. 31, 2016 |  |  |  | $ 38 | 80,686 | (60,142) | 20,582
Exercise of stock options (in shares) |  |  |  | 87,357 |  |  |
Exercise of stock options |  |  |  |  | 144 |  | 144
Share-based compensation |  |  |  |  | 2,707 |  | 2,707
Net loss |  |  |  |  |  | (12,308) | (12,308)
Balance (in shares) at Dec. 31, 2017 |  |  |  | 38,218,660 |  |  |
Balance at Dec. 31, 2017 |  |  |  | $ 38 | 83,537 | (72,450) | $ 11,125
Exercise of stock options (in shares) |  |  |  | 2,140 |  |  | 2,488
Exercise of stock options |  |  |  | $ 0 | 4 |  | $ 4
Share-based compensation |  |  |  |  | 2,774 |  | 2,774
Net loss |  |  |  |  |  | (13,987) | (13,987)
Adjustments to opening balance for change in accounting principle at Dec. 31, 2017 |  |  |  |  |  | 76 | 76
Sale of common stock and warrants, net of issuance costs of $200 |  |  |  | $ 5 | 3,795 |  | 3,800
Sale of common stock and warrants, net of issuance costs of $200 (in shares) |  |  |  | 5,333,332 |  |  |
Restricted stock units vested and issued (in shares) |  | 57,108 |  |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  |  | 43,611,240 |  |  |
Balance at Dec. 31, 2018 |  |  |  | $ 43 | $ 90,110 | $ (86,361) | $ 3,792

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