Accounts Receivable and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounts Receivable
Unbilled revenue	$ 5,900		$ 23,800
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	837	$ 576
Expense (recovery)	574	0
Write off	(141)	(56)
Other	0	2
Balance at End of Period	$ 1,270	$ 522