Leases - Supplemental Balance Sheet Information - Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Operating lease assets	$ 27,322	$ 473
Liabilities:
Current portion of operating lease liabilities	937	285
Noncurrent operating lease liabilities	31,120	211
Total operating lease liabilities	$ 32,057	$ 496