Deferred Revenue - Summary of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Deferred Revenue Disclosure [Abstract]
Balance at beginning of period	$ 7,088	$ 764
Deferral of revenue	319	658
Recognition of deferred revenue	(6,872)	(378)
Balance at end of period	$ 535	$ 1,044