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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2012 $ (8,238) $ 2,948 $ 10 $ (58) $ 164,334 $ (175,472) $ 0
Balance (in shares) at Dec. 31, 2012   294,720,231 1,098,914 14,381      
Share-based compensation 862 $ 0 $ 0 $ 0 862 0 0
Issuance of common stock, net of offering costs 83,623 $ 0 $ 58 $ 0 83,565 0 0
Issuance of common stock, net of offering costs (in shares)   0 5,750,000 0      
Conversion of preferred stock to common stock 1,860 $ (2,948) $ 171 $ 0 4,637 0 0
Conversion of preferred stock to common stock (in shares)   (294,720,231) 17,060,634 0      
Stock option exercises $ 1,068 $ 0 $ 13 $ 0 1,055 0 0
Stock option exercises (in shares) 1,268,049 0 1,268,049 0      
Net loss $ (261) $ 0 $ 0 $ 0 0 (261) 0
Balance at Dec. 31, 2013 78,914 $ 0 $ 252 $ (58) 254,453 (175,733) 0
Balance (in shares) at Dec. 31, 2013   0 25,177,597 14,381      
Share-based compensation 3,244 $ 0 $ 0 $ 0 3,244 0 0
Issuance of common stock, net of offering costs $ 76,716 $ 0 $ 22 $ 0 76,694 0 0
Issuance of common stock, net of offering costs (in shares)   0 2,250,000 0      
Stock option exercises (in shares) 568,906            
Stock plan related activity $ 725 $ 0 $ 6 $ (19) 738 0 0
Stock plan related activity (in shares)   0 568,041 865      
Retirement of treasury stock 0 $ 0 $ 0 $ 58 (58) 0 0
Retirement of treasury stock (in shares)   0 0 (14,381)      
Net loss (38,313) $ 0 $ 0 $ 0 0 (38,313) 0
Balance at Dec. 31, 2014 121,286 $ 0 $ 280 $ (19) 335,071 (214,046) 0
Balance (in shares) at Dec. 31, 2014   0 27,995,638 865      
Share-based compensation 7,847 $ 0 $ 0 $ 0 7,847 0 0
Issuance of common stock, net of offering costs $ 203,467 $ 0 $ 60 $ 0 203,407 0 0
Issuance of common stock, net of offering costs (in shares)   0 5,976,827 0      
Stock option exercises (in shares) 374,214            
Stock plan related activity $ 882 $ 0 $ 3 $ (29) 908 0 0
Stock plan related activity (in shares)   0 373,289 925      
Retirement of treasury stock 0 $ 0 $ 0 $ 48 (48) 0 0
Retirement of treasury stock (in shares)   0 0 (1,790)      
Unrealized loss on investments (5) $ 0 $ 0 $ 0 0 0 (5)
Net loss (20,140) 0 0 0 0 (20,140) 0
Balance at Dec. 31, 2015 $ 313,337 $ 0 $ 343 $ 0 $ 547,185 $ (234,186) $ (5)
Balance (in shares) at Dec. 31, 2015   0 34,345,754 0