Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	November 2019 Offering [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	November 2019 Offering [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	November 2019 Offering [Member] Common Stock [Member]	November 2019 Offering [Member] Additional Paid-in Capital [Member]	November 2019 Offering [Member] Retained Earnings [Member]	November 2019 Offering [Member]	Purchase Agreement with LPC [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Purchase Agreement with LPC [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Purchase Agreement with LPC [Member] Common Stock [Member]	Purchase Agreement with LPC [Member] Additional Paid-in Capital [Member]	Purchase Agreement with LPC [Member] Retained Earnings [Member]	Purchase Agreement with LPC [Member]	Series A Warrants [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Series A Warrants [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Series A Warrants [Member] Common Stock [Member]	Series A Warrants [Member] Additional Paid-in Capital [Member]	Series A Warrants [Member] Retained Earnings [Member]	Series A Warrants [Member]	Series B Warrants [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Series B Warrants [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Series B Warrants [Member] Common Stock [Member]	Series B Warrants [Member] Additional Paid-in Capital [Member]	Series B Warrants [Member] Retained Earnings [Member]	Series B Warrants [Member]	Series A-2 Warrants [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Series A-2 Warrants [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Series A-2 Warrants [Member] Common Stock [Member]	Series A-2 Warrants [Member] Additional Paid-in Capital [Member]	Series A-2 Warrants [Member] Retained Earnings [Member]	Series A-2 Warrants [Member]	Series B-2 Warrants [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Series B-2 Warrants [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Series B-2 Warrants [Member] Common Stock [Member]	Series B-2 Warrants [Member] Additional Paid-in Capital [Member]	Series B-2 Warrants [Member] Retained Earnings [Member]	Series B-2 Warrants [Member]	Director [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Director [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Director [Member] Common Stock [Member]	Director [Member] Additional Paid-in Capital [Member]	Director [Member] Retained Earnings [Member]	Director [Member]	Consultant [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Consultant [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Consultant [Member] Common Stock [Member]	Consultant [Member] Additional Paid-in Capital [Member]	Consultant [Member] Retained Earnings [Member]	Consultant [Member]	Employees [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	Employees [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Employees [Member] Common Stock [Member]	Employees [Member] Additional Paid-in Capital [Member]	Employees [Member] Retained Earnings [Member]	Employees [Member]	Preferred Stock [Member] Series A Preferred Stock [Member]	Preferred Stock [Member] Series B Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Total
Balances (in shares) at Dec. 31, 2018																																																									463,630
Balances at Dec. 31, 2018																																																										$ 160,297	$ (155,385)			$ 4,912
Stock-based compensation expense																																																										470				470
Issuance of common shares from employee stock purchase plan (in shares)																																																									429
Issuance of common shares from employee stock purchase plan																																																										35				35
Issuance of restricted common shares in connection with consulting agreement (in shares)																																																									274
Issuance of restricted common shares in connection with consulting agreement																																																										25				25
Net loss																																																											(10,029)			(10,029)
Restricted stock awards (in shares)																																																									6
Restricted stock awards																																																										1				1
Stock-based compensation expense																																																										470				470
Balances (in shares) at Mar. 31, 2019																																																									464,339
Balances at Mar. 31, 2019																																																										160,828	(165,414)			(4,586)
Balances (in shares) at Dec. 31, 2018																																																									463,630
Balances at Dec. 31, 2018																																																										160,297	(155,385)			4,912
Net loss																																																														(27,709)
Balances (in shares) at Sep. 30, 2019																																																									1,469,789
Balances at Sep. 30, 2019																																																										168,304	(183,094)			(14,790)
Balances (in shares) at Dec. 31, 2018																																																									463,630
Balances at Dec. 31, 2018																																																										160,297	(155,385)			4,912
Series B convertible preferred stock dividends paid in PIK shares (in shares)																																																													378
Balances (in shares) at Dec. 31, 2019																																																							1,852,173	31,678	7,075,684
Balances at Dec. 31, 2019																																																									$ 1	214,431	(197,911)			16,521	[1]
Balances (in shares) at Mar. 31, 2019																																																									464,339
Balances at Mar. 31, 2019																																																										160,828	(165,414)			(4,586)
Stock-based compensation expense																																																										562				562
Issuance of common shares from employee stock purchase plan (in shares)																																																									602
Issuance of common shares from employee stock purchase plan																																																										20				20
Net loss																																																											(9,724)			(9,724)
Restricted stock awards (in shares)																																							525						250						6
Restricted stock awards																																								$ 48		$ 48				$ 11		$ 11
Stock-based compensation expense																																																										562				562
Balances (in shares) at Jun. 30, 2019																																																									465,722
Balances at Jun. 30, 2019																																																										161,469	(175,138)			(13,669)
Stock-based compensation expense																																																										503				503
Issuance of common shares from employee stock purchase plan (in shares)																																																									200
Issuance of common shares from employee stock purchase plan																																																										1				1
Net loss																																																											(7,956)			(7,956)
Issuance of initial purchase common shares under the Purchase Agreement with LPC (in shares)																																																									1,004,171
Issuance of initial purchase common shares under the Purchase Agreement with LPC																																																										6,322				6,322
Restricted stock awards (in shares)																																							378												4
Restricted stock awards																																								14		14
Stock-based compensation expense																																																										503				503
Reverse stock split - cancellation and payout of fractional shares (in shares)																																																									(686)
Reverse stock split - cancellation and payout of fractional shares																																																										(5)				(5)
Balances (in shares) at Sep. 30, 2019																																																									1,469,789
Balances at Sep. 30, 2019																																																										168,304	(183,094)			(14,790)
Balances (in shares) at Dec. 31, 2019																																																							1,852,173	31,678	7,075,684
Balances at Dec. 31, 2019																																																									$ 1	214,431	(197,911)			16,521	[1]
Issuance costs				$ (30)		$ (30)
Conversion of Series A convertible preferred stock into common stock (in shares)																																																							(1,852,173)		1,852,173
Conversion of Series A convertible preferred stock into common stock
Issuance of common shares in connection with warrant exercises (in shares)															1,026,240						45,473
Issuance of common shares in connection with warrant exercises																$ 1,591		$ 1,591				$ 70		$ 70
Series B convertible preferred stock dividends																																																										(990)				(990)
Series B convertible preferred stock dividends paid in PIK shares (in shares)																																																								989
Series B convertible preferred stock dividends paid in PIK shares																																																										989				989
Stock-based compensation expense																																																										686				686
Issuance of common shares from employee stock purchase plan (in shares)																																																									320
Issuance of common shares from employee stock purchase plan
Issuance of restricted common shares in connection with consulting agreement (in shares)																																																									28,313
Issuance of restricted common shares in connection with consulting agreement																																																										24				24
Net loss																																																											(6,310)			(6,310)
Stock-based compensation expense																																																										686				686
Balances (in shares) at Mar. 31, 2020																																																								32,667	10,028,203
Balances at Mar. 31, 2020																																																									$ 1	216,771	(204,221)			12,551
Balances (in shares) at Dec. 31, 2019																																																							1,852,173	31,678	7,075,684
Balances at Dec. 31, 2019																																																									$ 1	214,431	(197,911)			16,521	[1]
Issuance of common shares in connection with warrant exercises (in shares)																														3,928,284						203,800
Series B convertible preferred stock dividends paid in PIK shares (in shares)																																																													3,057
Net loss																																																														(17,160)
Issuance of initial purchase common shares under the Purchase Agreement with LPC (in shares)																																																												5,473,410
Balances (in shares) at Sep. 30, 2020																																																								34,735	21,653,782
Balances at Sep. 30, 2020																																																									$ 2	226,158	(215,071)			11,089
Balances (in shares) at Mar. 31, 2020																																																								32,667	10,028,203
Balances at Mar. 31, 2020																																																									$ 1	216,771	(204,221)			12,551
Issuance costs				$ (3)		$ (3)				$ (452)		$ (452)
Issuance of common shares in connection with warrant exercises (in shares)															4,852,284						293,490
Issuance of common shares in connection with warrant exercises															$ 1	2,959		2,960				179		179
Series B convertible preferred stock dividends																																																										(1,021)				(1,021)
Series B convertible preferred stock dividends paid in PIK shares (in shares)																																																								1,018
Series B convertible preferred stock dividends paid in PIK shares																																																										1,018				1,018
Stock-based compensation expense																																																										632				632
Issuance of common shares from employee stock purchase plan (in shares)																																																									300
Issuance of common shares from employee stock purchase plan
Issuance of restricted common shares in connection with consulting agreement (in shares)																																																									34,531
Issuance of restricted common shares in connection with consulting agreement																																																										25				25
Net loss																																																											(7,115)			(7,115)
Modification of warrants in connection with 2020 Warrant Offering																997		997				841		841
Issuance of Series A-2 and B-2 warrants in connection with 2020 Warrant Offering																																																										1,838				1,838
Issuance costs for Series A-2 and B-2 warrants in connection with 2020 Warrant Offering																																																										(1,838)				(1,838)
Transaction costs in connection with 2020 Warrant Offering																																																										(326)				(326)
Issuance of initial purchase common shares under the Purchase Agreement with LPC (in shares)																																																									525,000
Issuance of initial purchase common shares under the Purchase Agreement with LPC																																																										341				341
Restricted stock awards (in shares)																																																									250
Restricted stock awards
Stock-based compensation expense																																																										632				632
Balances (in shares) at Jun. 30, 2020																																																								33,685	15,734,058
Balances at Jun. 30, 2020																																																									$ 2	221,961	(211,336)			10,627
Issuance costs										$ (42)		$ (42)
Issuance of common shares in connection with warrant exercises (in shares)															1,117,020						3,824,104						892,300						38,990
Issuance of common shares in connection with warrant exercises																$ 681		$ 681				$ 2,333		$ 2,333				$ 568		$ 568				$ 25		$ 25
Series B convertible preferred stock dividends																																																										(1,053)				(1,053)
Series B convertible preferred stock dividends paid in PIK shares (in shares)																																																								1,050					1,050
Series B convertible preferred stock dividends paid in PIK shares																																																										1,050				1,050
Stock-based compensation expense																																																										617				617
Net loss																																																											(3,735)			(3,735)
Transaction costs in connection with 2020 Warrant Offering																																																										(7)				(7)
Restricted stock awards (in shares)																																							220												47,090
Restricted stock awards																																																				$ 25		$ 25
Stock-based compensation expense																																																										617				617
Balances (in shares) at Sep. 30, 2020																																																								34,735	21,653,782
Balances at Sep. 30, 2020																																																									$ 2	$ 226,158	$ (215,071)			$ 11,089

[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date.