Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Series A Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series A Convertible Preferred Stock [Member]
Additional Paid-in Capital [Member]
USD ($)
Series A Convertible Preferred Stock [Member]
USD ($)
Common Stock [Member]
USD ($)
Preferred Stock [Member]
Additional Paid-in Capital [Member]
USD ($)
Retained Earnings [Member]
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Total
USD ($)
Balance at December 31, 2011 at Dec. 31, 2011       $ 353,851   $ 74,537 $ (389,911) $ (5,044) $ 33,433
Balance at December 31, 2011 (in Shares) at Dec. 31, 2011       43,613,107          
Net loss             (3,415)   (3,415)
Unrealized gains/losses on available-for-sale securities               8 8
Stock issued       2   50,283     50,285
Stock issued (in Shares)       13,512,500          
Issuances under employee stock purchase plan           182     182
Issuances under employee stock purchase plan (in Shares)       55,424          
Restricted stock units converted           231     231
Restricted stock units converted (in Shares)       32,551          
Share-based compensation expense           1,590     1,590
Stock options exercised           9     9
Stock options exercised (in Shares)       2,655         2,655
Balance at Dec. 31, 2012       353,853   126,832 (393,326) (5,036) 82,323
Balance (in Shares) at Dec. 31, 2012       57,216,237          
Net loss             (38,759)   (38,759)
Unrealized gains/losses on available-for-sale securities               (15) (15)
Stock issued       1   25,955     25,956
Stock issued (in Shares)       13,346,901          
Issuances under employee stock purchase plan           113     113
Issuances under employee stock purchase plan (in Shares)       74,829          
Restricted stock units converted           66     66
Restricted stock units converted (in Shares)       35,176          
Share-based compensation expense           1,866     1,866
Balance at Dec. 31, 2013       353,854   154,832 (432,085) (5,051) 71,550
Balance (in Shares) at Dec. 31, 2013       70,673,143         70,673,143
Net loss             (49,963)   (49,963)
Unrealized gains/losses on available-for-sale securities               (40) (40)
Stock issued   18,693 18,693 1   21,552     21,553
Stock issued (in Shares) 10,000     11,517,478          
Acquisition of Alpine Biosciences, Inc. (Alpine)       1   27,232     27,233
Acquisition of Alpine Biosciences, Inc. (Alpine) (in Shares)       9,245,344          
Issuances under employee stock purchase plan           114     114
Issuances under employee stock purchase plan (in Shares)       76,811          
Restricted stock units converted           287     287
Restricted stock units converted (in Shares)       82,576          
Share-based compensation expense           1,832     1,832
Stock options exercised           7     7
Stock options exercised (in Shares)       6,000         6,000
Balance at Dec. 31, 2014       $ 353,856   $ 224,549 $ (482,048) $ (5,091) $ 91,266
Balance (in Shares) at Dec. 31, 2014       91,601,352 10,000       91,601,352