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)

v3.7.0.1
Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member]
$ in Thousands
Jun. 30, 2017
USD ($)
Assets  
Total assets $ 14,188
Warrant [Member]  
Liabilities  
Liabilities 114
Cash [Member]  
Assets  
Total assets 822
Money market securities (cash equivalents) [Member]  
Assets  
Total assets 13,094
Restricted cash [Member]  
Assets  
Total assets 272
Level 1 [Member]  
Assets  
Total assets 14,188
Level 1 [Member] | Cash [Member]  
Assets  
Total assets 822
Level 1 [Member] | Money market securities (cash equivalents) [Member]  
Assets  
Total assets 13,094
Level 1 [Member] | Restricted cash [Member]  
Assets  
Total assets 272
Level 3 [Member] | Warrant [Member]  
Liabilities  
Liabilities $ 114