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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning Balance at Dec. 31, 2015 $ 206,007 $ 3 $ 726,651 $ (147) $ (520,500)
Beginning Balance (in shares) at Dec. 31, 2015 32,466,842 32,466,842      
Stock-based compensation $ 87,990   87,990    
Exercises of stock options $ 351   351    
Exercises of stock options (in shares) 36,250 36,250      
Unrealized gain on available-for-sale securities $ 150     150  
Net loss (203,350)       (203,350)
Ending Balance at Sep. 30, 2016 $ 91,148 $ 3 $ 814,992 $ 3 $ (723,850)
Ending Balance (in shares) at Sep. 30, 2016 32,503,092 32,503,092