Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
REVENUE:
Total revenues	$ 1,082,000	$ 329,000
Cost of revenue	1,482,000	617,000
Gross loss	(400,000)	(288,000)
OPERATING EXPENSES:
Research and development	8,576,000	5,836,000
Sales and marketing	4,616,000	1,587,000
General and administrative	11,330,000	3,010,000
Total operating expenses	24,522,000	10,433,000
LOSS FROM OPERATIONS	(24,922,000)	(10,721,000)
OTHER INCOME (EXPENSE):
Change in fair value of embedded derivative liability and warrant liabilities	(32,000)	(103,000)
Interest income and other	424,000	3,000
Interest expense and other	(343,000)	(688,000)
Total other income (expense), net	49,000	(788,000)
Provision for income tax expense	8,000	0
Net loss	$ (24,881,000)	$ (11,509,000)
PER SHARE DATA
Net loss per common share (basic) (in dollars per share)	$ (0.16)	$ (0.11)
Net loss per common share (diluted) (in dollars per share)	$ (0.16)	$ (0.11)
Weighted average common shares outstanding (basic) (in shares)	155,515,093	101,362,036
Weighted average common shares outstanding (diluted) (in shares)	155,515,093	101,362,036
COMPREHENSIVE LOSS:
Net loss	$ (24,881,000)	$ (11,509,000)
Net unrealized loss on available-for-sale securities	(1,056,000)	0
Comprehensive loss	(25,937,000)	(11,509,000)
Prototype sales
REVENUE:
Total revenues	335,000	233,000
Development contracts
REVENUE:
Total revenues	$ 747,000	$ 96,000