Significant Accounting Policies - Assessment of Revenue under ASC 606 (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Accounts Receivable, Net [Roll Forward]
Amounts as of December 31, 2019	$ 9,006
Cash collected during the six months ended June 30, 2020 related to the Remaining Contracts	(6,201)
Amounts as of June 30, 2020	2,805
Deferred Cost of Sales [Roll Forward]
Amounts as of December 31, 2019	1,261
Cash collected during the six months ended June 30, 2020 related to the Remaining Contracts	(868)
Amounts as of June 30, 2020	$ 393