Leases - Lease Assets and Liabilities Recorded in Statement of Financial Position (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets And Liabilities Lessee [Line Items]
Operating lease, right-of-use asset, statement of financial position	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Operating lease, liability, current, statement of financial position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Operating lease, liability, noncurrent, statement of financial position	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Other Noncurrent Assets
Assets And Liabilities Lessee [Line Items]
Operating lease assets	$ 14,381	$ 22,401
Accounts Payable and Accrued Liabilities
Assets And Liabilities Lessee [Line Items]
Operating lease liabilities - current	10,713	11,289
Other Noncurrent Liabilities
Assets And Liabilities Lessee [Line Items]
Operating lease liabilities - long-term	3,643	10,665
Liabilities
Assets And Liabilities Lessee [Line Items]
Total operating lease liabilities	$ 14,356	$ 21,954