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Debt - Summary of Debt Discount Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]    
Beginning balance   $ 18
Discount on debt issued during the period   1,847
Amortization of debt discount   (430)
Extinguishment upon conversion of debt   (1,161)
Ending balance $ 274 274
Term Loan [Member]    
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]    
Discount on debt issued during the period   300
Amortization of debt discount   (26)
Ending balance 274 274
Convertible Notes Including 5X Notes [Member]    
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]    
Beginning balance   18
Amortization of debt discount   (18)
2015 Bridge Notes [Member]    
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]    
Discount on debt issued during the period   1,547
Amortization of debt discount $ 0 (386)
Extinguishment upon conversion of debt   $ (1,161)