CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 22,635	$ 45,044
Restricted cash		1,259
Royalty and milestone receivable	2,500	3,664
Prepaid expenses	1,571	1,823
Other current assets	744	780
Total current assets	27,450	52,570
Property and equipment, net	1,462	2,379
Operating lease right-of-use asset	5,303	1,584
Other assets		68
Total assets	34,215	56,601
Current liabilities:
Accounts payable and other accrued liabilities	3,499	3,462
Accrued compensation	2,105	2,077
Liability related to the sale of royalties, net - short-term		15,465
Current portion of long-term debt	2,000	11,667
Other current liabilities	1,102	2,086
Total current liabilities	8,706	34,757
Liability related to the sale of royalties, net - long-term		15,580
Long-term debt	1,456	3,707
Operating lease liability	6,079	1,341
Total liabilities	16,241	55,385
Stockholders' equity:
Preferred stock: $0.001 par value; 15,000,000 shares authorized, zero shares issued or outstanding
Common stock: $0.001 par value; 500,000,000 shares authorized; 4,898,143 and 4,898,143 shares issued and outstanding at December 31, 2022 and December 31, 2021, respectively	48	47
Additional paid-in capital	223,962	215,232
Accumulated deficit	(206,036)	(214,063)
Total stockholders' equity	17,974	1,216
Total liabilities and stockholders' equity	$ 34,215	$ 56,601