Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 143,736	$ 151,794
Investments	606,350	847,123
Accounts receivable		306
Contract asset		4,913
Prepaid expenses	16,702	12,110
Other current assets	3,315	3,259
Total current assets	770,103	1,019,505
Property and equipment, net	10,901	11,634
Operating lease assets	57,969	63,754
Restricted cash	2,707	2,578
Intangible asset	2,300	2,300
Total assets	843,980	1,099,771
Current liabilities:
Accounts payable	9,211	10,578
Accrued expenses	14,890	22,703
Operating lease liabilities	4,964	4,276
Other current liabilities	1,204	26,152
Total current liabilities	30,269	63,709
Operating lease liabilities, net of current portion	48,502	53,466
Contingent consideration liability	13,206	32,378
Total liabilities	91,977	149,553
Commitments and contingencies (Note 12)
Stockholders' equity:
Common stock, $0.001 par value; 300,000,000 shares authorized as of December 31, 2023, and December 31, 2022;127,462,409 and 121,112,234 shares issued and outstanding as of December 31, 2023 and December 31, 2022, respectively	127	121
Additional paid-in capital	2,152,654	2,019,126
Accumulated other comprehensive loss	(196)	(10,420)
Accumulated deficit	(1,400,582)	(1,058,609)
Total stockholders' equity	752,003	950,218
Total liabilities and stockholders' equity	$ 843,980	$ 1,099,771