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Statements of Changes in Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock Series A Convertible Preferred Stock | Preferred Stock Series B Convertible Preferred Stock | Preferred Stock Series C Convertible Preferred Stock | Preferred Stock Series C-1 Convertible Preferred Stock | Preferred Stock Series C-2 Convertible Preferred Stock | Preferred Stock Series D-1 Convertible Preferred Stock | Preferred Stock Series D-2 Convertible Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2013 | $ (108,109) | $ 250 | $ 4,215 | $ 28,121 | $ 0 | $ 13,500 | $ 16,952 | $ 24,119 | $ 0 | $ 5,168 | $ (113,277)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net loss | (4,234) |  |  |  |  |  |  |  |  |  | (4,234)
Exercise of stock options | 9 |  |  |  |  |  |  |  |  | 9 |
Stock-based compensation expense (Note 10) | 1,201 |  |  |  |  |  |  |  |  | 1,201 |
Issuance of stock | 54,583 |  |  |  |  |  |  | 544 | 6 | 54,577 |
Reclassification of warrants issued with preferred stock to derivative liability |  |  |  |  |  |  |  | (544) |  |  |
Beneficial conversion feature for sale of preferred stock | (909) |  |  |  |  |  |  | 909 |  | (909) |
Beneficial conversion feature for antidilution adjustment | (214) |  | 18 | 153 |  | 43 |  |  |  | (214) |
Adjustment of preferred stock to liquidation value | (510) |  | (18) | (153) |  | (43) |  | 724 |  | (510) |
Conversion of preferred stock into shares of common stock | 88,790 | (250) | (4,215) | (28,121) |  | (13,500) | (16,952) | (25,752) | 2 | 88,788 |
Warrant derivative liability reclassified to additional paid-in capital | 2,701 |  |  |  |  |  |  |  |  | 2,701 |
Exercise of common stock warrants | 55 |  |  |  |  |  |  |  |  | 55 |
Issuance of common stock - ESPP | 68 |  |  |  |  |  |  |  |  | 68 |
Ending balance at Dec. 31, 2014 | 33,431 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 150,934 | (117,511)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net loss | (32,623) |  |  |  |  |  |  |  |  |  | (32,623)
Stock-based compensation expense (Note 10) | 3,023 |  |  |  |  |  |  |  |  | 3,023 |
Issuance of stock | 38,012 |  |  |  |  |  |  |  | 6 | 38,006 |
Issuance of common stock - ESPP | 106 |  |  |  |  |  |  |  |  | 106 |
Ending balance at Dec. 31, 2015 | 41,949 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 192,069 | (150,134)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net loss | (29,989) |  |  |  |  |  |  |  |  |  | (29,989)
Stock-based compensation expense (Note 10) | 1,210 |  |  |  |  |  |  |  |  | 1,210 |
Debt discount for Solar Warrant | 244 |  |  |  |  |  |  |  |  | 244 |
Issuance of stock | 21,386 |  |  |  |  |  |  |  | 10 | 21,376 |
Issuance of common stock - ESPP | 19 |  |  |  |  |  |  |  |  | 19 |
Ending balance at Dec. 31, 2016 | $ 34,819 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 24 | $ 214,918 | $ (180,123)

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