Condensed Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2020	$ 12,162	$ 44	$ 231,412	$ (2)	$ (219,292)
Beginning balance, shares at Dec. 31, 2020		43,804,175
Issuance of common stock	59,088	$ 46	59,042
Issuance of common stock, shares		46,406,382
Issuance costs	(3,482)		(3,482)
Stock-based compensation expense	631		631
Unrealized gain (loss) on investments	(5)			(5)
Net loss	(6,975)				(6,975)
Ending balance at Mar. 31, 2021	61,419	$ 90	287,603	(7)	(226,267)
Ending balance, shares at Mar. 31, 2021		90,210,557
Beginning balance at Dec. 31, 2020	12,162	$ 44	231,412	(2)	(219,292)
Beginning balance, shares at Dec. 31, 2020		43,804,175
Unrealized gain (loss) on investments	8
Net loss	(12,661)
Ending balance at Jun. 30, 2021	56,130	$ 90	287,987	6	(231,953)
Ending balance, shares at Jun. 30, 2021		90,527,914
Beginning balance at Mar. 31, 2021	61,419	$ 90	287,603	(7)	(226,267)
Beginning balance, shares at Mar. 31, 2021		90,210,557
Exercise of stock options, Shares		67,357
Exercise of stock options	47		47
Issuance costs	(24)		(24)
RSU's vested, net of shares withheld/repurchased for tax	0
RSU's vested, net of shares withheld/repurchased for tax, Shares		250,000
Stock-based compensation expense	361		361
Unrealized gain (loss) on investments	13			13
Net loss	(5,686)				(5,686)
Ending balance at Jun. 30, 2021	56,130	$ 90	287,987	6	(231,953)
Ending balance, shares at Jun. 30, 2021		90,527,914
Beginning balance at Dec. 31, 2021	$ 43,904	$ 91	289,282	(13)	(245,456)
Beginning balance, shares at Dec. 31, 2021	90,573,597	90,573,597
RSU's vested, net of shares withheld/repurchased for tax	$ 0
RSU's vested, net of shares withheld/repurchased for tax, Shares		250,000
Stock-based compensation expense	689		689
Unrealized gain (loss) on investments	(62)			(62)
Net loss	(8,422)				(8,422)
Ending balance at Mar. 31, 2022	36,109	$ 91	289,971	(75)	(253,878)
Ending balance, shares at Mar. 31, 2022		90,823,597
Beginning balance at Dec. 31, 2021	$ 43,904	$ 91	289,282	(13)	(245,456)
Beginning balance, shares at Dec. 31, 2021	90,573,597	90,573,597
Exercise of stock options, Shares	0
Unrealized gain (loss) on investments	$ (88)
Net loss	(16,414)
Ending balance at Jun. 30, 2022	$ 28,619	$ 91	290,499	(101)	(261,870)
Ending balance, shares at Jun. 30, 2022	90,823,597	90,823,597
Beginning balance at Mar. 31, 2022	$ 36,109	$ 91	289,971	(75)	(253,878)
Beginning balance, shares at Mar. 31, 2022		90,823,597
Stock-based compensation expense	528		528
Unrealized gain (loss) on investments	(26)			(26)
Net loss	(7,992)				(7,992)
Ending balance at Jun. 30, 2022	$ 28,619	$ 91	$ 290,499	$ (101)	$ (261,870)
Ending balance, shares at Jun. 30, 2022	90,823,597	90,823,597