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Stock-Based Compensation - Summary of Option and RSU Activity (Details) - $ / shares
 3 Months Ended
Aug. 23, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Shares Available for Grant          
Options granted (in shares) (3,340,273)        
Number of Shares          
Options cancelled and expired (in shares) (4,569,959)        
Weighted Average Exercise Prices          
Weighted-average exercise price (in dollars per share) $ 0.72        
The Plans          
Shares Available for Grant          
Balance at the beginning of the year (in shares)   2,220,000 1,805,000 1,059,000  
Additional shares authorized     2,000,000 500,000  
Restricted stock units granted (in shares)   (1,439,000)      
Restricted stock units cancelled (in shares)   43,000 2,000 14,000  
Options granted (in shares)   (3,778,000)      
Options cancelled (in shares)   3,726,000 413,000 232,000  
Balance at the end of the year (in shares)   772,000 2,220,000 1,805,000  
Number of Shares          
Balance at the beginning of the period (in shares)   5,524,000 6,437,000 6,749,000  
Options granted (in shares)   3,778,000      
Options cancelled (in shares)   (3,726,000) (413,000) (232,000)  
Options cancelled and expired (in shares)     (500,000) (80,000)  
Balance at the end of the period (in shares)   5,576,000 5,524,000 6,437,000  
Weighted Average Exercise Prices          
Weighted-average exercise price (in dollars per share)   $ 1.50 $ 3.40 $ 3.51 $ 3.51
Options granted (in dollars per share)   0.70      
Options cancelled (in dollars per share)   $ 3.50 3.87 3.30  
Options cancelled and expired (in dollars per share)     $ 4.53 $ 4.18  
Inducement Stock Options          
Number of Shares          
Balance at the beginning of the period (in shares)   1,135,000 1,501,000 1,640,000  
Options cancelled (in shares)   (1,135,000) (366,000) (139,000)  
Balance at the end of the period (in shares)     1,135,000 1,501,000  
Weighted Average Exercise Prices          
Weighted-average exercise price (in dollars per share)     $ 4.61 $ 4.42 $ 4.37
Options cancelled (in dollars per share)   $ 4.61 $ 3.83 $ 3.87