Leases - Summary of Company's Operating Leases (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2019	Jan. 01, 2019
Assets
Operating lease assets	$ 61,593,000	$ 62,466,000	$ 5,580,000	$ 5,580
Liabilities
Current portion of operating lease liabilities	1,795,000	1,909,000
Noncurrent portion of operating lease liabilities	51,334,000	51,545,000
Total lease liabilities	$ 53,129,000	$ 53,454,000	$ 5,897,000	$ 5,897,000