Inventories - Reserve Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Inventory, Reserve [Roll Forward]
Beginning balance	$ (2,894)	$ (3,518)
Accrual	(101)	281
Reduction due to sold inventory	12	343
Reserves for excess, obsolete, and slow-moving inventories	$ (2,983)	$ (2,894)