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Warrants - Common Stock Warrants Issued for Consulting Services - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Class of Warrant or Right [Line Items]          
Stock based compensation expense   $ 2,441 $ 50 $ 4,272 $ 195
MTS Warrants [Member]          
Class of Warrant or Right [Line Items]          
Stock based compensation expense $ 211        
Warrants expiration date Aug. 31, 2020        
Warrant exercise price $ 11.80        
Number of warrants issued 30,000 30,000   30,000