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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Net revenue $ 1,620 $ 1,170 $ 6,124 $ 1,170
Costs and expenses:        
Cost of revenue (excluding amortization of certain acquired intangible assets) 247 258 925 258
Research and development 7,243 3,633 22,082 13,990
Selling, general, and administrative 7,268 4,129 23,698 8,369
Amortization of certain acquired intangible assets 70 43 259 43
Total costs and expenses 14,828 8,063 46,964 22,660
Operating Income (Loss) (13,208) (6,893) (40,840) (21,490)
Other income (expense):        
Change in fair value of warrants potentially settleable in cash 6,735 (1,614) 13,174 (7,135)
Interest income (expense), net (297) (314) (925) (495)
Other income (expense) 597 693 (59) 881
Total non-operating income (expense), net 7,035 (1,235) 12,190 (6,749)
Loss before income taxes (6,173) (8,128) (28,650) (28,239)
Income tax expense (benefit) 0 (1,159) 0 62
Net loss (6,173) (9,287) (28,650) (28,177)
Net loss per common share:        
Basic and diluted net loss per share (usd per share) $ (0.05) $ (0.11) $ (0.24) $ (0.33)
Weighted-average common shares outstanding: basic and diluted 119,038,656 87,319,450 117,767,791 84,678,612
Comprehensive loss        
Net loss (6,173) (9,287) (28,650) (28,177)
Reclassification of unrealized gain upon sale of marketable securities 0 (841) 0 (1,636)
Unrealized gain (loss) on marketable securities 0 (2,108)    1,795
Tax effect of reclassification of unrealized gain upon sale of marketable securities 0 330 0 643
Tax effect of unrealized gain on marketable securities 0 828 0 (705)
Total comprehensive loss $ (6,173) $ (11,078) $ (28,650) $ (28,080)