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)

v3.4.0.3
Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
Assets  
Total assets $ 46,386
Warrant [Member]  
Liabilities  
Liabilities 438
Cash [Member]  
Assets  
Total assets 4,350
Money market securities [Member]  
Assets  
Total assets 14,563
Restricted cash [Member]  
Assets  
Total assets 272
Corporate bonds and commercial paper [Member]  
Assets  
Total assets 27,201
Level 1 [Member]  
Assets  
Total assets 19,185
Level 1 [Member] | Cash [Member]  
Assets  
Total assets 4,350
Level 1 [Member] | Money market securities [Member]  
Assets  
Total assets 14,563
Level 1 [Member] | Restricted cash [Member]  
Assets  
Total assets 272
Level 2 [Member]  
Assets  
Total assets 27,201
Level 2 [Member] | Corporate bonds and commercial paper [Member]  
Assets  
Total assets 27,201
Level 3 [Member] | Warrant [Member]  
Liabilities  
Liabilities $ 438