Deferred Revenue - Summary of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Deferred Revenue Disclosure [Abstract]
Balance at beginning of period	$ 7,088	$ 764
Deferral of revenue	5	342
Recognition of deferred revenue included in deferred revenue at beginning of period	(638)	(187)
Balance at end of period	$ 6,455	$ 919