Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Assets  
Total assets $ 66,159
Warrant [Member]  
Liabilities  
Liabilities 2,836
Cash [Member]  
Assets  
Total assets 16,735
Money market securities [Member]  
Assets  
Total assets 25,742
Restricted cash [Member]  
Assets  
Total assets 222
Corporate bonds and commercial paper [Member]  
Assets  
Total assets 23,460
Level 1 [Member]  
Assets  
Total assets 42,699
Level 1 [Member] | Cash [Member]  
Assets  
Total assets 16,735
Level 1 [Member] | Money market securities [Member]  
Assets  
Total assets 25,742
Level 1 [Member] | Restricted cash [Member]  
Assets  
Total assets 222
Level 2 [Member]  
Assets  
Total assets 23,460
Level 2 [Member] | Corporate bonds and commercial paper [Member]  
Assets  
Total assets 23,460
Level 3 [Member] | Warrant [Member]  
Liabilities  
Liabilities $ 2,836