Condensed Consolidated Statements Of Operations And Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues:
Revenues	$ 0	$ 574,000	$ 709,000	$ 574,000
Cost and expenses:
Cost of revenues	8,400,000	727,000	10,653,000	727,000
Research and development	4,517,000	6,460,000	16,744,000	22,982,000
Sales and marketing	2,020,000	3,404,000	11,251,000	10,697,000
General and administrative	3,088,000	4,256,000	11,373,000	13,772,000
Total costs and expenses	18,025,000	14,847,000	50,021,000	48,178,000
Loss from operations	(18,025,000)	(14,273,000)	(49,312,000)	(47,604,000)
Other income (expense):
Interest income (expense), net	(14,000)	(9,000)	4,000	(640,000)
Total other income (expense)	(14,000)	(9,000)	4,000	(640,000)
Net loss	(18,039,000)	(14,282,000)	(49,308,000)	(48,244,000)
Other comprehensive gain (loss):
Unrealized gain on available-for-sale securities				1,000
Comprehensive loss	$ (18,039,000)	$ (14,282,000)	$ (49,308,000)	$ (48,243,000)
Net loss per share:
Basic net loss per share	$ (0.49)	$ (0.48)	$ (1.50)	$ (1.76)
Diluted net loss per share	$ (0.49)	$ (0.48)	$ (1.50)	$ (1.76)
Weighted average shares used to compute net loss per common share — basic	37,158	29,612	32,825	27,400
Weighted average shares used to compute net loss per common share — diluted	37,158	29,612	32,825	27,400
Product [Member]
Revenues:
Revenues		$ 574,000	$ 709,000	$ 574,000