Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2019	29,829,916
Balance at Dec. 31, 2019	$ 3	$ 31,923	$ (12,730)	$ 0	$ 19,196
Common shares issued upon exercise of stock options (in shares)	327,500
Common shares issued upon exercise of stock options	$ 0	566	0	0	566
Common shares issued upon vesting of restricted stock units (in shares)	101,557
Common shares issued upon vesting of restricted stock units	$ 0	0	0	0	0
Share-based compensation expense	0	1,563	0	0	1,563
Net loss for the period	$ 0	0	(9,024)	0	(9,024)
Common shares issued upon exercise of warrants at $6.50 per share (in shares)	261,679
Common shares issued upon exercise of warrants at $6.50 per share	$ 0	1,646	0	0	1,646
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs (in shares)	253,125
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs	$ 0	735	0	0	735
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs (in shares)	3,593,873
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs	$ 1	17,234	0	0	17,234
Common shares issued upon exercise of warrants at $6.00 per share, net of issuance costs (in shares)	675,000
Common shares issued upon exercise of warrants at $6.00 per share, net of issuance costs	$ 0	3,847	0	0	3,847
Net unrealized gain on short-term investments	$ 0	0	0	7	7
Sale of common stock and warrants at $6.00 per share in public offering, net of issuance costs (in shares)	2,066,667
Sale of common stock and warrants at $6.00 per share in public offering, net of issuance costs	$ 0	11,667	0	0	11,667
Balance (in shares) at Sep. 30, 2020	37,109,317
Balance at Sep. 30, 2020	$ 4	69,181	(21,754)	7	47,437
Balance (in shares) at Jun. 30, 2020	34,361,591
Balance at Jun. 30, 2020	$ 3	54,973	(17,892)	0	37,084
Common shares issued upon exercise of stock options (in shares)	34,250
Common shares issued upon exercise of stock options	$ 0	52	0	0	52
Common shares issued upon vesting of restricted stock units (in shares)	14,999
Common shares issued upon vesting of restricted stock units	$ 0	0	0	0	0
Share-based compensation expense	0	546	0	0	546
Net loss for the period	$ 0	0	(3,862)	0	(3,862)
Common shares issued upon exercise of warrants at $6.50 per share (in shares)	177,986
Common shares issued upon exercise of warrants at $6.50 per share	$ 0	1,102	0	0	1,102
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs (in shares)	102,621
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs	$ 0	295	0	0	295
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs (in shares)	1,742,870
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs	$ 1	8,366	0	0	8,366
Common shares issued upon exercise of warrants at $6.00 per share, net of issuance costs (in shares)	675,000
Common shares issued upon exercise of warrants at $6.00 per share, net of issuance costs	$ 0	3,847	0	0	3,847
Net unrealized gain on short-term investments	$ 0	0	0	7	7
Balance (in shares) at Sep. 30, 2020	37,109,317
Balance at Sep. 30, 2020	$ 4	69,181	(21,754)	7	47,437
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				915,404
Common shares issued upon exercise of stock options	$ 0	1,678	0	0	$ 1,678
Common shares issued upon vesting of restricted stock units (in shares)	421,407
Common shares issued upon vesting of restricted stock units	$ 0	0	0	0	0
Share-based compensation expense	0	4,310	0	0	4,310
Net unrealized loss on short-term investments	0	0	0	(4)	(4)
Net loss for the period	$ 0	0	(19,220)	0	(19,220)
Common shares issued upon exercise of warrants at $6.50 per share (in shares)	1,661,320
Common shares issued upon exercise of warrants at $6.50 per share	$ 0	10,799	0	0	10,799
Common shares issued upon exercise of warrants at $8.125 per share (in shares)	153,692
Common shares issued upon exercise of warrants at $8.125 per share	$ 0	1,249	0	0	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
Common shares issued upon vesting of restricted stock units (in shares)	79,133
Common shares issued upon vesting of restricted stock units	$ 0	0	0	0	0
Share-based compensation expense	0	1,303	0	0	1,303
Net unrealized loss on short-term investments	0	0	0	(2)	(2)
Net loss for the period	$ 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