Segment and Customer Concentration Information - Segment Operating Results and Reconciliation to the Consolidated Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue:
Revenue	$ 6,309	$ 3,424	$ 11,622	$ 7,296
Depreciation and amortization	675	613	1,332	1,241
Operating income (loss)	(44,201)	(19,850)	(73,445)	(34,685)
Other significant items:
Segment assets	626,167	50,216	626,167	50,216	$ 510,351
Inventories, net	4,318	4,961	4,318	4,961	$ 3,613
Reportable Segments
Revenue:
Revenue	9,362	4,313	17,092	9,027
Depreciation and amortization	675	613	1,333	1,241
Operating income (loss)	(44,245)	(19,850)	(73,350)	(34,685)
Other significant items:
Segment assets	628,869	52,903	628,869	52,903
Inventories, net	4,318	4,961	4,318	4,961
Eliminations
Revenue:
Revenue	(3,053)	(889)	(5,470)	(1,731)
Depreciation and amortization	0	0	(1)	0
Operating income (loss)	44	0	(95)	0
Other significant items:
Segment assets	(2,702)	(2,687)	(2,702)	(2,687)
Inventories, net	0	0	0	0
Autonomy Solutions
Revenue:
Revenue	5,822	2,809	10,158	6,106
Autonomy Solutions | Reportable Segments
Revenue:
Revenue	7,668	2,809	13,279	6,106
Depreciation and amortization	652	569	1,290	1,160
Operating income (loss)	(44,169)	(19,927)	(73,037)	(34,873)
Other significant items:
Segment assets	625,386	50,231	625,386	50,231
Inventories, net	4,288	4,961	4,288	4,961
Autonomy Solutions | Eliminations
Revenue:
Revenue	(1,846)	0	(3,121)	0
Component Sales
Revenue:
Revenue	487	615	1,464	1,190
Component Sales | Reportable Segments
Revenue:
Revenue	1,694	1,504	3,813	2,921
Depreciation and amortization	23	44	43	81
Operating income (loss)	(76)	77	(313)	188
Other significant items:
Segment assets	3,483	2,672	3,483	2,672
Inventories, net	30	0	30	0
Component Sales | Eliminations
Revenue:
Revenue	$ (1,207)	$ (889)	$ (2,349)	$ (1,731)