Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 4,327	$ 38,067
Restricted cash		11,250
Royalty receivable, current portion	3,090
Prepaid and other current assets	4,035	6,034
Current assets of discontinued operations	344
Total current assets	11,796	55,351
Fixed assets, net		78
License rights and other intangible assets, net	6,098	6,943
Royalty receivable, long term	18,484	20,253
Other non-current assets	58	253
Right of use assets	6,873	7,580
Total assets	43,309	90,458
Accounts payable	27	2,162
Accrued expenses and other current liabilities	3,133	18,846
Current liabilities of discontinued operations	3,694	25,831
Total current liabilities	6,854	46,839
Operating lease liabilities, non-current	6,532	7,369
Other non-current liabilities	636	1,107
Total liabilities	14,022	55,315
Commitments and contingencies (Note 8)
Common stock, par value $0.001; 32,000 and 12,000 shares authorized, 11,532 and 9,498 shares issued and outstanding as of December 31, 2023 and December 31, 2022, respectively	11	9
Additional paid-in capital	978,917	974,497
Accumulated deficit	(949,641)	(939,363)
Total stockholders’ equity	29,287	35,143
Total liabilities and stockholders’ equity	$ 43,309	$ 90,458