Revenue From Contracts With Customers - Summary of Allowance for Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 0	$ 0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Provision for bad debts		$ 28	$ (23)
Write-offs		(20)
Ending balance		23
Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 15	$ 15