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Significant Accounting Policies - Summary of the Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]    
Cash and cash equivalents at beginning of period $ 31,004 $ 35,710
Restricted cash at beginning of period 3,475 7,090
Cash and cash equivalents and restricted cash at beginning of period 34,479 42,800
Cash and cash equivalents at end of period 54,553 3,587
Restricted cash at end of period 2,862 4,466
Cash and cash equivalents and restricted cash at end of period 57,415 8,053
Net increase (decrease) in cash and cash equivalents and restricted cash $ 22,936 $ (34,747)