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)

v3.2.0.727
Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)
$ in Thousands
Jun. 30, 2015
USD ($)
Assets  
Total assets $ 60,376
Warrant [Member]  
Liabilities  
Liabilities 2,967
Cash [Member]  
Assets  
Total assets 11,036
Money market securities [Member]  
Assets  
Total assets 36,965
Restricted cash [Member]  
Assets  
Total assets 190
Corporate bonds and commercial paper [Member]  
Assets  
Total assets 12,185
Level 1 [Member]  
Assets  
Total assets 48,191
Level 1 [Member] | Cash [Member]  
Assets  
Total assets 11,036
Level 1 [Member] | Money market securities [Member]  
Assets  
Total assets 36,965
Level 1 [Member] | Restricted cash [Member]  
Assets  
Total assets 190
Level 2 [Member]  
Assets  
Total assets 12,185
Level 2 [Member] | Corporate bonds and commercial paper [Member]  
Assets  
Total assets 12,185
Level 3 [Member] | Warrant [Member]  
Liabilities  
Liabilities $ 2,967