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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2016 |  | 15,224,223 |  |  |
Beginning balance at Dec. 31, 2016 | $ 28,657 | $ 2 | $ 335,436 | $ (302,932) | $ (3,849)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock, shares |  | 17,000,000 |  |  |
Issuance of common stock, net of $356 in issuance costs | 15,524 | $ 2 | 15,522 |  |
Common stock warrants issued | (10,357) |  | (10,357) |  |
Issuance of common stock upon exercise of warrants, shares |  | 5,150,660 |  |  |
Issuance of common stock upon exercise of warrants | 4,913 |  | 4,913 |  |
Issuance of common stock in connection with employee stock purchase plan, shares |  | 4,048 |  |  |
Issuance of common stock in connection with employee stock purchase plan | 5 |  | 5 |  |
Stock-based compensation for directors and employees | 425 |  | 425 |  |
Fair value of common stock in exchange for services, shares |  | 90,343 |  |  |
Fair value of common stock in exchange for services | 82 |  | 82 |  |
Net loss | (20,122) |  |  | (20,122) |
Ending balance, shares at Jun. 30, 2017 |  | 37,469,274 |  |  |
Ending balance at Jun. 30, 2017 | $ 19,127 | $ 4 | $ 346,026 | $ (323,054) | $ (3,849)

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