Revenue, Deferred Revenue, Deferred Costs and Other - Deferred Cost and Other (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Device Cost And Other
Deferred device cost, current	$ 10,950	$ 3,384
Deferred execution credit, current	792	84
Total deferred cost and other, current	11,742	3,468
Deferred device cost, noncurrent	6,190	2,179
Total Deferred cost and other	$ 17,932	$ 5,647