Quarterly report pursuant to Section 13 or 15(d)

Cash and Restricted Cash - Summary of Reconciliation of Cash and Restricted Cash (Detail)

v3.10.0.1
Cash and Restricted Cash - Summary of Reconciliation of Cash and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Cash And Cash Equivalents [Abstract]        
Cash and cash equivalents $ 13,282 $ 9,167 $ 6,096  
Restricted cash 5,665 292 606  
Total cash and restricted cash $ 18,947 $ 9,459 $ 6,702 $ 23,923