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STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2014 | $ 130,712 | $ 157 | $ 1,059,072 | $ (928,433) | $ (84)
Balances (in shares) at Dec. 31, 2014 |  | 157,429,871 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net (loss) income | 46 |  |  | 46 |
Other comprehensive (loss) income | (129) |  |  |  | (129)
Stock-based compensation related to issuance of common stock and options in exchange for services | 364 |  | 364 |  |
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares) |  | 18,077 |  |  |
Issuance of common stock upon exercise of warrants | 881 | $ 1 | 880 |  |
Issuance of common stock upon exercise of warrants (in shares) |  | 235,000 |  |  |
Issuances of common stock under equity plans | 1,694 | $ 1 | 1,693 |  |
Issuances of common stock under equity plans (in shares) |  | 1,098,411 |  |  |
Stock-based compensation for equity- based awards to employees and directors | 8,397 |  | 8,397 |  |
401(k) contribution | 161 |  | 161 |  |
Balances at Dec. 31, 2015 | 142,126 | $ 159 | 1,070,567 | (928,387) | (213)
Balances (in shares) at Dec. 31, 2015 |  | 158,781,359 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net (loss) income | (29,537) |  |  | (29,537) |
Other comprehensive (loss) income | 160 |  |  |  | 160
Stock-based compensation related to issuance of common stock and options in exchange for services | 156 |  | 156 |  |
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares) |  | 21,541 |  |  |
Issuances of common stock under equity plans | 1,169 |  | 1,169 |  |
Issuances of common stock under equity plans (in shares) |  | 355,736 |  |  |
Stock-based compensation for equity- based awards to employees and directors | 8,245 |  | 8,245 |  |
401(k) contribution | 61 |  | 61 |  |
Balances at Dec. 31, 2016 | $ 122,380 | $ 159 | 1,080,198 | (957,924) | (53)
Balances (in shares) at Dec. 31, 2016 | 159,158,636 | 159,158,636 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net (loss) income | $ (27,916) |  |  | (27,916) |
Other comprehensive (loss) income | (154) |  |  |  | (154)
Issuance of common stock in connection with at market offering, net of issuance costs of $114 | 1,060 | $ 1 | 1,059 |  |
Issuance of common stock in connection with at market offering, net of issuance costs (in shares) |  | 614,230 |  |  |
Stock-based compensation related to issuance of common stock and options in exchange for services | 200 |  | 200 |  |
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares) |  | 72,066 |  |  |
Issuances of common stock under equity plans | 51 |  | 51 |  |
Issuances of common stock under equity plans (in shares) |  | 32,307 |  |  |
Stock-based compensation for equity- based awards to employees and directors | 8,144 |  | 8,144 |  |
401(k) contribution | 32 |  | 32 |  |
Balances at Dec. 31, 2017 | $ 103,797 | $ 160 | $ 1,089,684 | $ (985,840) | $ (207)
Balances (in shares) at Dec. 31, 2017 | 159,877,239 | 159,877,239 |  |  |

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