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)

v3.19.3
Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member]
$ in Thousands
Sep. 30, 2019
USD ($)
Assets  
Total assets $ 7,425
Cash [Member]  
Assets  
Total assets 1,724
Money market securities (cash equivalents) [Member]  
Assets  
Total assets 5,651
Restricted cash [Member]  
Assets  
Total assets 50
Level 1 [Member]  
Assets  
Total assets 7,425
Level 1 [Member] | Cash [Member]  
Assets  
Total assets 1,724
Level 1 [Member] | Money market securities (cash equivalents) [Member]  
Assets  
Total assets 5,651
Level 1 [Member] | Restricted cash [Member]  
Assets  
Total assets $ 50