Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 221,274	$ 133,334
Restricted Cash	697	701
Marketable securities	291,931	96,208
Prepaid expenses and other current assets	7,933	10,504
Total current assets	521,835	240,747
Property, plant and equipment, net	31,288	28,495
Operating lease right-of-use assets	28,074	27,849
Other non-current assets	1,000	1,036
Total assets	582,197	298,127
Current liabilities:
Accounts payable	3,459	5,584
Accrued liabilities	24,568	18,876
Lease liabilities	4,272	3,320
Deferred revenue	3,518	0
Total current liabilities	35,817	27,780
Lease liabilities, non-current	24,853	25,439
Deferred revenue, non-current	146,116	0
Total liabilities	206,786	53,219
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value; 200,000,000 shares authorized; no shares issued and outstanding	0	0
Additional paid-in-capital	839,659	598,373
Accumulated other comprehensive loss	(462)	(66)
Accumulated deficit	(464,213)	(353,724)
Total stockholders’ equity	375,411	244,908
Total liabilities and stockholders’ equity	582,197	298,127
Common Stock Class Undefined
Stockholders' equity:
Common stock, value	290	261
Non-voting Common Stock
Stockholders' equity:
Common stock, value	$ 137	$ 64