Commitment and Contingencies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitment to acquire equipment and services	$ 7,400
Cumulative purchases made to date	6,900
Reimbursement received from government agency	6,900
Amount purchased	270		$ 6,200
Remaining accounts payable to vendors	124		1,000
Rent expense	212	$ 233	892	$ 897
Rental income from noncancelable sublease	30	$ 45	$ 182	$ 182
Future minimum rental payments to be received under sublease	$ 0