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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