Revenue - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Services revenue	$ 866,000	$ 2,044,000
Grant revenue	1,071,000	1,495,000
Provision for contract losses	370,000	$ 33,737,000
Amortization of loss on contracts	400,000
Revenue recognized from prior performance obligation	0
Revenue, remaining performance obligation	$ 38,500,000
Two Customers | Revenue Benchmark | Customer Concentration Risk
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Concentration risk, percentage	97.00%	99.00%
Two Customers | Accounts Receivable | Customer Concentration Risk
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Concentration risk, percentage	92.00%		90.00%
Project revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Services revenue	$ 816,000	$ 1,991,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	21.00%
Revenue, remaining performance obligation, period	12 months