Revenue, Deferred Revenue, Deferred Costs and Other - Deferred Cost and Other (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020
Deferred Device Cost And Other
Deferred device cost, current		$ 3,384
Deferred device cost, noncurrent		2,179
Total Deferred cost and other	$ 5,563	$ 5,563
Change in Deferred Device Cost And Other
Beginning balance	0
Additions	6,007
Cost of revenue recognized	(444)
Ending Balance	$ 5,563