Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated other comprehensive loss
Balance, shares at Dec. 31, 2019		29,829,916
Balance, amount at Dec. 31, 2019	$ 19,196,000	$ 3,000	$ 31,923,000	$ (12,730,000)	$ 0
Sale of common stock and warrants at $6.00 per share in public offering, net of issuance costs, shares		2,066,667
Sale of common stock and warrants at $6.00 per share in public offering, net of issuance costs, amount	11,667,000	$ 0	11,667,000	0	0
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs, shares		150,504
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs, amount	440,000	$ 0	440,000	0	0
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs, shares		1,851,003
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs, amount	8,868,000	$ 0	8,868,000	0	0
Common shares issued upon exercise of warrants at $6.50 per share, shares		83,693
Common shares issued upon exercise of warrants at $6.50 per share, amount	544,000	$ 0	544,000	0	0
Common shares issued upon exercise of stock options, shares		293,250
Common shares issued upon exercise of stock options, amount	515,000	$ 0	515,000	0	0
Common shares issued upon vesting of restricted stock units, shares		86,558
Common shares issued upon vesting of restricted stock units, amount	0	$ 0	0	0	0
Share-based compensation expense	1,016,000	0	1,016,000	0	0
Net unrealized gain on short-term investments	0	0	0	0	0
Net loss for the period	(5,162,000)	$ 0	0	(5,162,000)	0
Common shares issued for services, amount	0
Balance, shares at Jun. 30, 2020		34,361,591
Balance, amount at Jun. 30, 2020	37,084,000	$ 3,000	54,973,000	(17,892,000)	0
Balance, shares at Mar. 31, 2020		30,073,724
Balance, amount at Mar. 31, 2020	18,118,000	$ 3,000	33,191,000	(15,076,000)	0
Sale of common stock and warrants at $6.00 per share in public offering, net of issuance costs, shares		2,066,667
Sale of common stock and warrants at $6.00 per share in public offering, net of issuance costs, amount	11,667,000	$ 0	11,667,000	0	0
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs, shares		138,721
Common shares issued upon exercise of warrants at $3.00 per share, net of issuance costs, amount	405,000	$ 0	405,000	0	0
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs, shares		1,731,603
Common shares issued upon exercise of warrants at $5.00 per share, net of issuance costs, amount	8,271,000	$ 0	8,271,000	0	0
Common shares issued upon exercise of warrants at $6.50 per share, shares		83,693
Common shares issued upon exercise of warrants at $6.50 per share, amount	544,000	$ 0	544,000	0	0
Common shares issued upon exercise of stock options, shares		180,625
Common shares issued upon exercise of stock options, amount	346,000	$ 0	346,000	0	0
Common shares issued upon vesting of restricted stock units, shares		86,558
Common shares issued upon vesting of restricted stock units, amount	0	$ 0	0	0	0
Share-based compensation expense	549,000	0	549,000	0	0
Net unrealized gain on short-term investments	0	0	0	0	0
Net loss for the period	(2,816,000)	$ 0	0	(2,816,000)	0
Balance, shares at Jun. 30, 2020		34,361,591
Balance, amount at Jun. 30, 2020	37,084,000	$ 3,000	54,973,000	(17,892,000)	0
Balance, shares at Dec. 31, 2020		37,554,162
Balance, amount at Dec. 31, 2020	46,414,000	$ 4,000	71,705,000	(25,310,000)	15,000
Common shares issued upon exercise of warrants at $6.50 per share, shares		1,661,320
Common shares issued upon exercise of warrants at $6.50 per share, amount	10,799,000	$ 0	10,799,000	0	0
Common shares issued upon exercise of stock options, shares		157,066
Common shares issued upon exercise of stock options, amount	278,000	$ 0	278,000	0	0
Common shares issued upon vesting of restricted stock units, shares		342,274
Common shares issued upon vesting of restricted stock units, amount	0	$ 0	0	0	0
Share-based compensation expense	3,007,000	0	3,007,000	0	0
Net unrealized gain on short-term investments	(2,000)
Net loss for the period	(13,228,000)	$ 0	0	(13,228,000)	0
Common shares issued upon exercise of warrants at $8.125 per share, shares		153,692
Common shares issued upon exercise of warrants at $8.125 per share, amount	1,249,000	$ 0	1,249,000	0	0
Common shares issued for services, shares		42,876
Common shares issued for services, amount	239,000	$ 0	239,000	0	0
Net unrealized loss on short-term investments	(2,000)	$ 0	0	0	(2,000)
Balance, shares at Jun. 30, 2021		39,911,390
Balance, amount at Jun. 30, 2021	48,756,000	$ 4,000	87,277,000	(38,538,000)	13,000
Balance, shares at Mar. 31, 2021		37,711,698
Balance, amount at Mar. 31, 2021	42,059,000	$ 4,000	72,777,000	(30,739,000)	17,000
Common shares issued upon exercise of warrants at $6.50 per share, shares		1,661,320
Common shares issued upon exercise of warrants at $6.50 per share, amount	10,799,000	$ 0	10,799,000	0	0
Common shares issued upon exercise of stock options, shares		82,066
Common shares issued upon exercise of stock options, amount	165,000	$ 0	165,000	0	0
Common shares issued upon vesting of restricted stock units, shares		277,614
Common shares issued upon vesting of restricted stock units, amount	0	$ 0	0	0	0
Share-based compensation expense	2,148,000	0	2,148,000	0	0
Net unrealized gain on short-term investments	(4,000)
Net loss for the period	(7,799,000)	$ 0	0	(7,799,000)	0
Common shares issued upon exercise of warrants at $8.125 per share, shares		153,692
Common shares issued upon exercise of warrants at $8.125 per share, amount	1,249,000	$ 0	1,249,000	0	0
Common shares issued for services, shares		25,000
Common shares issued for services, amount	139,000	$ 0	139,000	0	0
Net unrealized loss on short-term investments	(4,000)	$ 0	0	0	(4,000)
Balance, shares at Jun. 30, 2021		39,911,390
Balance, amount at Jun. 30, 2021	$ 48,756,000	$ 4,000	$ 87,277,000	$ (38,538,000)	$ 13,000