Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member] Warrants at $6.50 Per Share [Member]	Common Stock [Member] Warrants at $8.125 Per Share [Member]	Common Stock [Member]	Additional Paid-in Capital [Member] Warrants at $6.50 Per Share [Member]	Additional Paid-in Capital [Member] Warrants at $8.125 Per Share [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member] Warrants at $6.50 Per Share [Member]	Retained Earnings [Member] Warrants at $8.125 Per Share [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member] Warrants at $6.50 Per Share [Member]	AOCI Attributable to Parent [Member] Warrants at $8.125 Per Share [Member]	AOCI Attributable to Parent [Member]	Warrants at $6.50 Per Share [Member]	Warrants at $8.125 Per Share [Member]	Total
Balance (in shares) at Dec. 31, 2020			37,554,162
Balance at Dec. 31, 2020			$ 4			$ 71,705			$ (25,310)			$ 15			$ 46,414
Common shares issued upon exercise of stock options (in shares)			915,404
Common shares issued upon exercise of stock options			$ 0			1,678			0			0			1,678
Share-based compensation expense			$ 0			4,310			0			0			4,310
Common shares issued upon vesting of restricted stock units (in shares)			421,407
Net unrealized gain (loss) on short-term investments			$ 0			0			0			(4)			(4)
Net loss			$ 0			0			(19,220)			0			(19,220)
Common shares issued upon exercise of warrants (in shares)	1,661,320	153,692
Common shares issued upon exercise of warrants	$ 0	$ 0		$ 10,799	$ 1,249		$ 0	$ 0		$ 0	$ 0		$ 10,799	$ 1,249
Common shares issued for services (in shares)			42,876
Common shares issued for services			$ 0			239			0			0			239
Balance (in shares) at Sep. 30, 2021			40,748,861
Balance at Sep. 30, 2021			$ 4			89,979			(44,530)			11			45,464
Balance (in shares) at Jun. 30, 2021			39,911,390
Balance at Jun. 30, 2021			$ 4			87,277			(38,539)			13			48,755
Common shares issued upon exercise of stock options (in shares)			758,338
Common shares issued upon exercise of stock options			$ 0			1,399			0			0			1,399
Share-based compensation expense			$ 0			1,303			0			0			1,303
Common shares issued upon vesting of restricted stock units (in shares)			79,133
Net unrealized gain (loss) on short-term investments			$ 0			0			0			(2)			(2)
Net loss			$ 0			0			(5,991)			0			(5,991)
Balance (in shares) at Sep. 30, 2021			40,748,861
Balance at Sep. 30, 2021			$ 4			89,979			(44,530)			11			45,464
Balance (in shares) at Dec. 31, 2021			40,851,945
Balance at Dec. 31, 2021			$ 4			91,025			(49,759)			(6)			$ 41,264
Common shares issued upon exercise of stock options (in shares)			55,500												55,500
Common shares issued upon exercise of stock options			$ 0			83			0			0			$ 83
Share-based compensation expense			$ 0			2,628			0			0			2,628
Common shares issued upon vesting of restricted stock units (in shares)			218,133
Net unrealized gain (loss) on short-term investments			$ 0			0			0			62			62
Net loss			$ 0			0			(14,082)			0			(14,082)
Balance (in shares) at Sep. 30, 2022			41,125,578
Balance at Sep. 30, 2022			$ 4			93,736			(63,841)			56			29,955
Balance (in shares) at Jun. 30, 2022			40,992,161
Balance at Jun. 30, 2022			$ 4			92,856			(59,976)			(17)			32,867
Common shares issued upon exercise of stock options (in shares)			5,500
Common shares issued upon exercise of stock options			$ 0			8			0			0			8
Share-based compensation expense			$ 0			872			0			0			872
Common shares issued upon vesting of restricted stock units (in shares)			127,917
Net unrealized gain (loss) on short-term investments			$ 0			0			0			73			73
Net loss			$ 0			0			(3,865)			0			(3,865)
Balance (in shares) at Sep. 30, 2022			41,125,578
Balance at Sep. 30, 2022			$ 4			$ 93,736			$ (63,841)			$ 56			$ 29,955