Leases - Supplemental Balance Sheet Information - Operating Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Operating lease assets	$ 27,957	$ 27,322	[1]
Liabilities:
Current portion of operating lease liabilities	1,133	937	[1]
Noncurrent operating lease liabilities	32,843	31,120	[1]
Total operating lease liabilities	$ 33,976	$ 32,057

[1] The balance sheet as of December 31, 2020 is derived from the audited financial statements as of that date.