Revenue From Contracts With Customers - Summary of Allowance for Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 19
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201912Member	us-gaap:AccountingStandardsUpdate201613Member
Provision for credit losses	$ 2	$ 11
Ending balance	$ 21	26
Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Beginning balance		$ 15