Significant Accounting Policies - Summary of the Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents at beginning of year	$ 110,082	$ 31,004	$ 35,710
Restricted cash at beginning of year	2,657	3,475	7,090
Cash and cash equivalents and restricted cash at beginning of year	112,739	34,479	42,800
Cash and cash equivalents at end of year	107,180	110,082	31,004
Restricted cash at end of year	656	2,657	3,475
Cash and cash equivalents and restricted cash at end of year	107,836	112,739	34,479
Net (decrease) increase in cash and cash equivalents and restricted cash	$ (4,903)	$ 78,260	$ (8,321)