Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Details)

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Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense   $ 96,000 $ 2,027,000 $ 846,000 $ 10,851,000
Number of stock options granted during the period       1,684,759  
RSUs          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Fair value of shares vested       $ 23,000  
Stock-based compensation expense       $ 23,000  
Granted       30,000  
Stock Options to Non-employees          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of stock options granted during the period       0  
2012 Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issuable with respect to awards granted, additional 1,000,000        
Shares issuable with respect to awards granted 4,586,181        
Shares available for grant   1,483,015   1,483,015