Revenue From Contracts With Customers - Summary of Allowance for Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts Notes And Loans Receivable [Line Items]
Beginning balance		$ 19
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201912Member	us-gaap:AccountingStandardsUpdate201613Member
Provision for credit losses		$ 8	$ 29
Write-offs			(20)
Ending balance		$ 27	24
Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 15		$ 15