CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 45,044	$ 39,979
Restricted cash	1,259	2,555
Royalty receivable	3,664	2,369
Prepaid expenses	1,823	2,228
Other current assets	780	133
Total current assets	52,570	47,264
Property and equipment, net	2,379	2,815
Operating lease right-of-use asset	1,584	2,722
Other assets	68	746
Total assets	56,601	53,547
Current liabilities:
Accounts payable and other accrued liabilities	3,462	5,583
Accrued compensation	2,077	2,757
Liability related to the sale of future royalties, net - short-term	15,465
Current portion of long-term debt	11,667	5,000
Other current liabilities	2,086	1,199
Total current liabilities	34,757	14,539
Liability related to the sale of future royalties, net - long-term	15,580
Loan payable - long-term	3,707	20,054
Operating lease liability	1,341	2,360
Total liabilities	55,385	36,953
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 4,410,909 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	47	46
Additional paid-in capital	215,232	202,154
Accumulated deficit	(214,063)	(185,606)
Total stockholders' equity	1,216	16,594
Total liabilities and stockholders' equity	$ 56,601	$ 53,547