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Statements Of Stockholders' Equity - USD ($) | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 45,000 | $ 152,363,000 | $ 1,000 | $ (104,107,000) | $ 48,302,000
Balance, Shares at Dec. 31, 2013 | 45,510,038 |  |  |  |
Issuance of common stock pursuant to exercise of stock options | $ 1,000 | 378,000 |  |  | 379,000
Issuance of common stock pursuant to exercise of stock options, shares | 246,079 |  |  |  |
Stock options for employees |  | 3,619,000 |  |  | 3,619,000
Stock options for non-employees |  | 142,000 |  |  | 142,000
Net loss |  |  |  | (12,386,000) | (12,386,000)
Balance at Dec. 31, 2014 | $ 46,000 | 156,502,000 | 1,000 | (116,493,000) | 40,056,000
Balance, Shares at Dec. 31, 2014 | 45,756,117 |  |  |  |
Stock options for employees |  | 3,453,000 |  |  | 3,453,000
Stock options for non-employees |  | 4,000 |  |  | 4,000
Other comprehensive loss |  |  | $ (1,000) |  | (1,000)
Net loss |  |  |  | (14,145,000) | (14,145,000)
Balance at Dec. 31, 2015 | $ 46,000 | 159,959,000 |  | (130,638,000) | $ 29,367,000
Balance, Shares at Dec. 31, 2015 | 45,756,117 |  |  |  |
Issuance of common stock pursuant to exercise of stock options, shares |  |  |  |  |
Stock options for employees |  | 3,467,000 |  |  | $ 3,467,000
Stock options for non-employees |  | 25,000 |  |  | 25,000
Performance Awards and related non-cash stock-related compensation, shares | $ 485,000 | 842,000 |  |  | 842,000
Performance Awards related to statutory taxes, shares | (99,182) | (214,000) |  |  | (214,000)
Net loss |  |  |  | (14,850,000) | (14,850,000)
Balance at Dec. 31, 2016 | $ 46,000 | $ 164,079,000 |  | $ (145,488,000) | $ 18,637,000
Balance, Shares at Dec. 31, 2016 | 46,141,935 |  |  |  |

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