Segment and Customer Concentration Information - Segment Operating Results and Reconciliation to the Consolidated Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue:
Revenue	$ 5,313	$ 3,872
Depreciation and amortization	657	628
Operating income (loss)	(29,244)	(14,835)
Other significant items:
Segment assets	651,214	35,498	$ 510,351
Inventories, net	3,283	6,168	$ 3,613
Reportable Segments
Revenue:
Revenue	7,730	4,714
Depreciation and amortization	658	628
Operating income (loss)	(29,105)	(14,835)
Other significant items:
Segment assets	653,919	38,583
Inventories, net	3,283	6,168
Eliminations
Revenue:
Revenue	(2,417)	(842)
Depreciation and amortization	(1)	0
Operating income (loss)	(139)	0
Other significant items:
Segment assets	(2,705)	(3,085)
Inventories, net	0	0
Autonomy Solutions
Revenue:
Revenue	4,336	3,297
Autonomy Solutions | Reportable Segments
Revenue:
Revenue	5,611	3,297
Depreciation and amortization	638	591
Operating income (loss)	(28,868)	(14,946)
Other significant items:
Segment assets	650,211	36,068
Inventories, net	3,245	6,168
Autonomy Solutions | Eliminations
Revenue:
Revenue	(1,275)	0
Component Sales
Revenue:
Revenue	977	575
Component Sales | Reportable Segments
Revenue:
Revenue	2,119	1,417
Depreciation and amortization	20	37
Operating income (loss)	(237)	111
Other significant items:
Segment assets	3,708	2,515
Inventories, net	38	0
Component Sales | Eliminations
Revenue:
Revenue	$ (1,142)	$ (842)