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Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations [Abstract]        
Cash and cash equivalents $ 134,758 $ 69,418 $ 163,620 $ 102,138
Restricted cash 4,826 2,475 2,375 375
Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 139,584 $ 71,893 $ 165,995 $ 102,513