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Debt - Summary of Carrying Amount (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Short And Long Term Debt [Line Items]    
Debt discount $ (274) $ (18)
Carrying amount 6,726 39,703
Term Loan [Member]    
Short And Long Term Debt [Line Items]    
Outstanding principal 7,000  
Debt discount $ (274)  
Convertible Notes Including 5X Notes [Member]    
Short And Long Term Debt [Line Items]    
Outstanding principal   29,088
Debt discount   (18)
5X Conversion Liability [Member]    
Short And Long Term Debt [Line Items]    
Outstanding principal   $ 10,633