CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 72,111	$ 112,584
Marketable securities	49,855	33,818
Other receivables	1,620	2,280
Tax incentive receivable, current	371	361
Prepaid expenses and other current assets	8,747	8,829
Total current assets	132,704	157,872
Property and equipment, net	888	1,026
Operating lease right of use assets	6,309	6,530
Other assets	5,929	5,644
Total assets	145,830	171,072
Current liabilities:
Accounts payable	4,780	1,101
Liability related to the sale of future royalties, current	50,902	0
Accrued expenses and other current liabilities	9,060	14,350
Operating lease liabilities	1,369	1,362
Deferred Revenue, Current	2,093	1,857
Derivative liability, current	995	0
Total current liabilities	69,199	18,670
Non-current operating lease liabilities	5,726	5,973
Liability related to the sale of future royalties, non-current	0	48,414
Deferred revenue, non-current	8,304	8,786
Derivative Liability, Noncurrent	0	802
Other long-term liabilities	128	138
Total liabilities	83,357	82,783
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized, 3,218,152 shares issued and outstanding as of March 31, 2022 and 3,218,152 shares issued and outstanding as of December 31, 2021	3	3
Common stock, $0.001 par value; 120,000,000 shares authorized as of March 31, 2022 and December 31, 2021; 32,755,559 shares issued and outstanding as of March 31, 2022 and 32,393,738 shares issued and outstanding as of December 31, 2021	33	32
Additional paid-in capital	462,735	455,719
Accumulated deficit	(400,292)	(367,463)
Accumulated other comprehensive gain (loss)	(6)	(2)
Total stockholders' equity	62,473	88,289	$ 118,846
Total liabilities and stockholders' equity	$ 145,830	$ 171,072