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STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss | Total
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2013 | $ 131 | $ 952,403 | $ (892,763) | $ (14) | $ 59,757
Balances (in shares) at Dec. 31, 2013 | 130,677,949 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net (loss) income |  |  | (35,670) |  | (35,670)
Other comprehensive (loss) income |  |  |  | (70) | (70)
Issuance of common stock in connection with public offering, net of issuance costs of $6,695 | $ 26 | 96,779 |  |  | 96,805
Issuance of common stock in connection with public offering, net of issuance costs (in shares) | 25,875,000 |  |  |  |
Stock-based compensation related to issuance of common stock and options in exchange for services |  | 253 |  |  | 253
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares) | 71,239 |  |  |  |
Issuance of common stock upon net exercise of warrants (in shares) | 168,039 |  |  |  |
Issuances of common stock under equity plans, net of cancellations of non-vested restricted stock |  | 1,555 |  |  | 1,555
Issuances of common stock under equity plans, net of cancellations of non-vested restricted stock (in shares) | 564,950 |  |  |  |
Stock-based compensation for equity-based awards to employees and directors |  | 7,658 |  |  | 7,658
401(k) contribution |  | 424 |  |  | 424
401(k) contribution (in shares) | 72,694 |  |  |  |
Balances at Dec. 31, 2014 | $ 157 | 1,059,072 | (928,433) | (84) | 130,712
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 | $ 1 | 880 |  |  | 881
Issuance of common stock upon exercise of warrants (in shares) | 235,000 |  |  |  |
Issuances of common stock under equity plans, net of cancellations of non-vested restricted stock | $ 1 | 1,693 |  |  | 1,694
Issuances of common stock under equity plans, net of cancellations of non-vested restricted stock (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 | $ 159 | 1,070,567 | (928,387) | (213) | $ 142,126
Balances (in shares) at Dec. 31, 2015 | 158,781,359 |  |  |  | 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, net of cancellations of non-vested restricted stock |  | 1,169 |  |  | 1,169
Issuances of common stock under equity plans, net of cancellations of non-vested restricted stock (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 | $ 159 | $ 1,080,198 | $ (957,924) | $ (53) | $ 122,380
Balances (in shares) at Dec. 31, 2016 | 159,158,636 |  |  |  | 159,158,636

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