Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Net income (loss)	$ (10,278)	$ 111,997
Less: Income (loss) from discontinued operations, net of tax	(2,579)	110,923
Net income (loss) from continuing operations	(7,699)	1,074
Adjustments to reconcile net income (loss) to net cash provided by (used in) continuing operating activities:
Depreciation and amortization	922	1,193
Share-based payment compensation costs	1,271	11,572
Make-whole payment accretion		(354)
Other	(129)	(40)
Changes in operating assets and liabilities:
Prepaid and other current assets	1,999	620
Other assets	(1,126)	(7,636)
Accounts payable	(2,135)	(1,211)
Accrued expenses and other current liabilities	(15,713)	4,262
Other non-current liabilities	(471)	(121)
Total adjustments	(15,382)	8,285
Net cash provided by (used in) continuing operating activities	(23,081)	9,359
Cash flows from continuing investing activities:
Receipts (payment) for patents		(355)
Net cash used in continuing investing activities		(355)
Cash flows from continuing financing activities:
Proceeds from sale of common stock, net of costs	3,151	2,454
Proceeds from sale of common stock related to employee stock purchase plan		14
Repayments of debt		(219,432)
Proceeds from Series A Preferred Stock, net of transaction costs		21,684
Repurchase of Preferred Stock at liquidation preference		(38,657)
Proceeds from make-whole derivative		3,322
Repayment of make-whole derivative		(2,969)
Payment of debt financing fees		(1,622)
Net cash provided by (used in) continuing financing activities	3,151	(235,206)
Discontinued operations:
Net cash used in operating activities	(25,060)	(13,437)
Net cash provided by investing activities	0	223,834
Net cash provided by financing activities	0	0
Net cash provided by (used in) discontinued operations	(25,060)	210,397
Net decrease in cash	(44,990)	(15,805)
Cash and restricted cash - continuing operations, beginning of period	49,317	64,907
Cash and restricted cash - discontinued operations, beginning of period		215
Total cash and restricted cash, end of period	4,327	49,317
Supplemental disclosure of cash flow information:
Interest paid		13,545
Supplemental disclosure of noncash financing activities:
Warrants issued in relation to debt financing agreement		$ 2,727