Accounts Receivable and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounts Receivable
Unbilled revenue	$ 8,400		$ 23,800
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	837	$ 576
Expense	341	255
Write off	(274)	(59)
Other	0	2
Balance at End of Period	$ 904	$ 774