Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	ATM Program [Member] Series A Preferred Stock, Mezzanine Equity [Member]	ATM Program [Member] Common Stock [Member]	ATM Program [Member] Additional Paid-in Capital [Member]	ATM Program [Member] Retained Earnings [Member]	ATM Program [Member] Treasury Stock, Common [Member]	ATM Program [Member]	Series A Preferred Stock, Mezzanine Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Total
Balance - September 30, 2022 (in shares)							0	565			0
Balance - September 30, 2022							$ 0	$ 0	$ 830,259	$ (785,324)	$ (3,054)	$ 41,881
Balance (in shares) at Dec. 31, 2021							0	565			0
Balance at Dec. 31, 2021							$ 0	$ 0	830,259	(785,324)	$ (3,054)	41,881
Net loss							0	0	0	(8,127)	0	(8,127)
Stock-based compensation expense							$ 0	$ 0	770	0	$ 0	770
Issuance of common stock, ATM Program, net of issuance costs (in shares)	0	4			0
Issuance of common stock, ATM Program, net of issuance costs	$ 0	$ 0	$ 205	$ 0	$ 0	$ 205
Balance (in shares) at Mar. 31, 2022							0	569			0
Balance at Mar. 31, 2022							$ 0	$ 0	831,234	(793,451)	$ (3,054)	34,729
Balance (in shares) at Dec. 31, 2021							0	565			0
Balance at Dec. 31, 2021							$ 0	$ 0	830,259	(785,324)	$ (3,054)	41,881
Net loss												(29,516)
Balance (in shares) at Sep. 30, 2022							0	653			0
Balance at Sep. 30, 2022							$ 0	$ 0	835,314	(814,840)	$ (3,054)	17,420
Balance - September 30, 2022 (in shares)							0	569			0
Balance - September 30, 2022							$ 0	$ 0	831,234	(793,451)	$ (3,054)	34,729
Balance (in shares) at Mar. 31, 2022							0	569			0
Balance at Mar. 31, 2022							$ 0	$ 0	831,234	(793,451)	$ (3,054)	34,729
Net loss							0	0	0	(17,333)	0	(17,333)
Stock-based compensation expense							$ 0	$ 0	781	0	$ 0	781
Issuance of common stock, ATM Program, net of issuance costs (in shares)	0	19			0
Issuance of common stock, ATM Program, net of issuance costs	$ 0	$ 0	$ 1,020	$ 0	$ 0	$ 1,020
Balance (in shares) at Jun. 30, 2022							0	588			0
Balance at Jun. 30, 2022							$ 0	$ 0	833,035	(810,784)	$ (3,054)	19,197
Balance - September 30, 2022 (in shares)							0	588			0
Balance - September 30, 2022							$ 0	$ 0	833,035	(810,784)	$ (3,054)	19,197
Net loss							0	0	0	(4,056)	0	(4,056)
Stock-based compensation expense							$ 0	$ 0	744	0	$ 0	744
Issuance of common stock, ATM Program, net of issuance costs (in shares)							0	65			0
Issuance of common stock, ATM Program, net of issuance costs							$ 0	$ 0	1,535	0	$ 0	1,535
Balance (in shares) at Sep. 30, 2022							0	653			0
Balance at Sep. 30, 2022							$ 0	$ 0	835,314	(814,840)	$ (3,054)	17,420
Balance - September 30, 2022 (in shares)							0	653			0
Balance - September 30, 2022							$ 0	$ 0	835,314	(814,840)	$ (3,054)	17,420
Balance - September 30, 2022 (in shares)							39	772			0
Balance - September 30, 2022							$ 0	$ 0	837,598	(824,532)	$ (3,054)	10,012
Balance (in shares) at Dec. 31, 2022							39	772			0
Balance at Dec. 31, 2022							$ 0	$ 0	837,598	(824,532)	$ (3,054)	10,012
Net loss							0	0	0	(4,111)	0	(4,111)
Stock-based compensation expense							$ 0	$ 0	285	0	$ 0	285
Redemption of Series A Preferred Stock (in shares)							(39)	0			0
Vesting of restricted stock units (in shares)							0	2			0
Exercise of common stock warrants, net of expenses of $276 (in shares)							0	118			0
Exercise of common stock warrants, net of expenses of $276							$ 0	$ 1	842	0	$ 0	843
Reverse split adjustments - fractional share round ups (in shares)							0	17			0
Balance (in shares) at Mar. 31, 2023							0	909			0
Balance at Mar. 31, 2023							$ 0	$ 1	838,725	(828,643)	$ (3,054)	7,029
Balance (in shares) at Dec. 31, 2022							39	772			0
Balance at Dec. 31, 2022							$ 0	$ 0	837,598	(824,532)	$ (3,054)	10,012
Net loss												(15,137)
Balance (in shares) at Sep. 30, 2023							0	5,148			0
Balance at Sep. 30, 2023							$ 0	$ 5	850,202	(839,669)	$ (3,054)	7,484
Balance - September 30, 2022 (in shares)							0	909			0
Balance - September 30, 2022							$ 0	$ 1	838,725	(828,643)	$ (3,054)	7,029
Balance (in shares) at Mar. 31, 2023							0	909			0
Balance at Mar. 31, 2023							$ 0	$ 1	838,725	(828,643)	$ (3,054)	7,029
Net loss							0	0	0	(6,601)	0	(6,601)
Stock-based compensation expense							$ 0	$ 0	382	0	$ 0	382
Issuance of common stock, ATM Program, net of issuance costs (in shares)							0	4,239			0
Issuance of common stock, ATM Program, net of issuance costs							$ 0	$ 4	10,790	0	$ 0	10,794
Balance (in shares) at Jun. 30, 2023							0	5,148			0
Balance at Jun. 30, 2023							$ 0	$ 5	849,897	(835,244)	$ (3,054)	11,604
Balance - September 30, 2022 (in shares)							0	5,148			0
Balance - September 30, 2022							$ 0	$ 5	849,897	(835,244)	$ (3,054)	11,604
Net loss							0	0	0	(4,425)	0	(4,425)
Stock-based compensation expense							$ 0	$ 0	305	0	$ 0	305
Balance (in shares) at Sep. 30, 2023							0	5,148			0
Balance at Sep. 30, 2023							$ 0	$ 5	850,202	(839,669)	$ (3,054)	7,484
Balance - September 30, 2022 (in shares)							0	5,148			0
Balance - September 30, 2022							$ 0	$ 5	$ 850,202	$ (839,669)	$ (3,054)	$ 7,484