CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 78,537	$ 59,248
Short-term Investments	162,427	235,607
Accounts receivable	862	1,025
Prepaid expenses and other current assets	11,623	12,507
Total current assets	253,449	308,387
Property and equipment, net	2,722	2,813
Right-of-use asset	1,442	1,522
Intangible assets, net	8,527	4,658
Restricted cash	328	328
Other long-term assets	18,356	11,815
Total assets	284,824	329,523
Current liabilities:
Accounts payable	12,010	5,737
Accrued expenses and other current liabilities	25,199	30,084
Contract liability	9,440	7,000
Lease liability	625	606
Total current liabilities	47,274	43,427
Long-term liabilities:
Lease liability	1,781	1,945
Total liabilities	49,055	45,372
Stockholders' equity:
Preferred Stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding at March 31, 2022 and December 31, 2021
Common stock, $0.001 par value: 120,000,000 shares authorized; 50,393,731 and 50,283,574 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	50	50
Additional paid-in capital	818,051	813,041
Accumulated other comprehensive loss	(629)	(1)
Accumulated deficit	(581,703)	(528,939)
Total stockholders' equity	235,769	284,151
Total liabilities and stockholders' equity	$ 284,824	$ 329,523