CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning balance, value at Dec. 31, 2020	$ (124,001)	$ 6	$ 754,938	$ (878,945)
Beginning balance, shares at Dec. 31, 2020		5,995,000
Shares issued for sale of common stock, net of cost	184,115	$ 3	184,112
Shares issued for sale of common stock, net of cost (in shares)		2,435,000
Shares issued for exercise of warrants, net of cashless exercises	278		278
Shares issued for exercise of warrants, net of cashless exercises (in shares)		22,000
Shares issued for exercise of options	$ 44		44
Shares issued for exercise of options (in shares)	2,000	2,000
Shares issued for vested restricted and performance stock units (in shares)		136,000
Shares issued for sale of common stock related to employee stock purchase plan	$ 233		233
Shares issued for sale of common stock related to employee stock purchase plan (in shares)		7,000
Share-based payment award compensation costs	18,125		18,125
Net income (loss)	(172,415)			(172,415)
Ending balance, value at Dec. 31, 2021	$ (93,621)	$ 9	957,730	(1,051,360)
Ending balance, shares at Dec. 31, 2021	8,598,000	8,597,000
Shares issued for sale of common stock, net of cost	$ 2,454		2,454
Shares issued for sale of common stock, net of cost (in shares)		565,000
Lender warrants	2,727		2,727
Rounding for fractional shares in connection with the reverse stock split		142,000
Shares issued for vested restricted and performance stock units (in shares)		189,000
Shares issued for sale of common stock related to employee stock purchase plan	14		14
Shares issued for sale of common stock related to employee stock purchase plan (in shares)		5,000
Share-based payment award compensation costs	11,572		11,572
Net income (loss)	111,997			111,997
Ending balance, value at Dec. 31, 2022	$ 35,143	$ 9	$ 974,497	$ (939,363)
Ending balance, shares at Dec. 31, 2022	9,498,000	9,498,000