Condensed Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balances at Dec. 31, 2018	$ 51,000	$ 145,685,000	$ (138,042,000)	$ 7,694,000
Balances (in shares) at Dec. 31, 2018	5,069,633
Forfeiture of restricted stock awards		(39,000)		(39,000)
Forfeiture of restricted stock awards (in shares)	(32,714)
Issuance of common stock and conversion of deferred consideration for asset acquisition	$ 5,000	1,457,000		1,462,000
Issuance of common stock and conversion of deferred consideration for asset acquisition (in shares)	516,976
Issuance of common stock in connection with reverse merger	$ 23,000	10,686,000		10,709,000
Issuance of common stock in connection with reverse merger (in shares)	2,389,135
Sale of common stock, net of issuance costs	$ 20,000	9,955,000		9,975,000
Sale of common stock, net of issuance costs (in shares)	1,991,269
Stock-based compensation		3,224,000		3,224,000
Net loss			(14,893,000)	(14,893,000)
Balances at Sep. 30, 2019	$ 99,000	170,968,000	(152,935,000)	18,132,000
Balances (in shares) at Sep. 30, 2019	9,934,299
Balances at Jun. 30, 2019	$ 99,000	168,509,000	(145,980,000)	22,628,000
Balances (in shares) at Jun. 30, 2019	9,958,546
Forfeiture of restricted stock awards		(39,000)		(39,000)
Forfeiture of restricted stock awards (in shares)	(24,247)
Stock-based compensation		2,498,000		2,498,000
Net loss			(6,955,000)	(6,955,000)
Balances at Sep. 30, 2019	$ 99,000	170,968,000	(152,935,000)	18,132,000
Balances (in shares) at Sep. 30, 2019	9,934,299
Balances at Dec. 31, 2019	$ 99,000	172,015,000	(157,521,000)	14,593,000
Balances (in shares) at Dec. 31, 2019	9,922,758
Forfeiture of restricted stock awards (in shares)	(4,010)
Sale of common stock, net of issuance costs	$ 87,000	22,723,000		22,810,000
Sale of common stock, net of issuance costs (in shares)	8,710,800
Exercise of warrants		81,000		81,000
Exercise of warrants (in shares)	14,464
Return of restricted stock awards for tax withholdings		(8,000)		(8,000)
Return of restricted stock awards for tax withholdings, shares	(2,511)
Exercise of employee stock options	$ 1,000	86,000		$ 87,000
Exercise of employee stock options (in shares)	27,382			27,382
Stock-based compensation		2,613,000		$ 2,613,000
Net loss			(15,557,000)	(15,557,000)
Balances at Sep. 30, 2020	$ 187,000	197,510,000	(173,078,000)	24,619,000
Balances (in shares) at Sep. 30, 2020	18,668,883
Balances at Jun. 30, 2020	$ 186,000	196,761,000	(167,309,000)	29,638,000
Balances (in shares) at Jun. 30, 2020	18,641,501
Exercise of employee stock options	$ 1,000	86,000		87,000
Exercise of employee stock options (in shares)	27,382
Stock-based compensation		663,000		663,000
Net loss			(5,769,000)	(5,769,000)
Balances at Sep. 30, 2020	$ 187,000	$ 197,510,000	$ (173,078,000)	$ 24,619,000
Balances (in shares) at Sep. 30, 2020	18,668,883