Significant Accounting Policies - Summary of the Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents at beginning of year	$ 31,004	$ 35,710	$ 14,208
Restricted cash at beginning of year	3,475	7,090	4,270
Cash and cash equivalents and restricted cash	34,479	42,800	18,478
Cash and cash equivalents at end of year	110,082	31,004	35,710
Restricted cash at end of year	2,657	3,475	7,090
Cash and cash equivalents and restricted cash at end of year	112,739	34,479	42,800
Net increase (decrease) in cash and cash equivalents and restricted cash	$ 78,260	$ (8,321)	$ 24,322