Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($)	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balances at the beginning of the period at Dec. 31, 2018	$ 0	$ 1,000	$ 97,401,000	$ (71,088,000)	$ 26,314,000
Balances at the beginning of the period (in shares) at Dec. 31, 2018		8,104,757
Changes in equity
Issuance of common stock in private placement, net of issuance costs			4,958,000		4,958,000
Issuance of common stock in private placement, net of issuance costs (in shares)		801,820
Exercise of stock options			17,000		17,000
Exercise of stock options (in shares)		5,650
Stock-based compensation			1,521,000		1,521,000
Net loss				(24,033,000)	(24,033,000)
Balances at the end of the period at Sep. 30, 2019	0	$ 1,000	103,897,000	(95,121,000)	8,777,000
Balances at the end of the period (shares) at Sep. 30, 2019		8,912,227
Balances at the beginning of the period at Jun. 30, 2019	$ 0	$ 1,000	98,395,000	(87,534,000)	10,862,000
Balances at the beginning of the period (in shares) at Jun. 30, 2019	0	8,107,290
Changes in equity
Issuance of common stock in private placement, net of issuance costs			4,958,000		4,958,000
Issuance of common stock in private placement, net of issuance costs (in shares)		801,820
Exercise of stock options			9,000		9,000
Exercise of stock options (in shares)		3,117
Stock-based compensation			535,000		535,000
Net loss				(7,587,000)	(7,587,000)
Balances at the end of the period at Sep. 30, 2019	$ 0	$ 1,000	103,897,000	(95,121,000)	8,777,000
Balances at the end of the period (shares) at Sep. 30, 2019		8,912,227
Balances at the beginning of the period at Dec. 31, 2019	0	$ 1,000	104,404,000	(100,769,000)	3,636,000
Balances at the beginning of the period (in shares) at Dec. 31, 2019		8,918,461
Changes in equity
Exercise of stock options			14,000		$ 14,000
Exercise of stock options (in shares)		4,913			4,913
Stock-based compensation			1,562,000		$ 1,562,000
Net loss				(16,510,000)	(16,510,000)
Balances at the end of the period at Sep. 30, 2020	$ 0	$ 1,000	105,980,000	(117,279,000)	(11,298,000)
Balances at the end of the period (shares) at Sep. 30, 2020	0	8,923,374
Balances at the beginning of the period at Jun. 30, 2020		$ 1,000	105,418,000	(111,493,000)	(6,074,000)
Balances at the beginning of the period (in shares) at Jun. 30, 2020	0	8,923,374
Changes in equity
Stock-based compensation			562,000		562,000
Net loss				(5,786,000)	(5,786,000)
Balances at the end of the period at Sep. 30, 2020	$ 0	$ 1,000	$ 105,980,000	$ (117,279,000)	$ (11,298,000)
Balances at the end of the period (shares) at Sep. 30, 2020	0	8,923,374