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Warrants - Common Stock Warrants Issued With Term Loan - Additional Information (Detail) - Hercules Warrants [Member] - USD ($)
$ / shares in Units, $ in Thousands
Sep. 30, 2015
Jun. 16, 2015
Jun. 11, 2015
Class of Warrant or Right [Line Items]      
Term loan in the principal amount     $ 7,000
Number of warrants granted 25,150 25,150  
Warrant exercise price   $ 8.35  
Value of warrants $ 198