Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 140,164	$ 121,231
Restricted Cash	658	689
Marketable securities	233,232	305,931
Prepaid expenses and other current assets	10,702	10,570
Total current assets	384,756	438,421
Property, plant and equipment, net	36,731	33,484
Operating lease right-of-use assets	39,098	39,591
Other non-current assets	2,157	2,003
Total assets	462,742	513,499
Current liabilities:
Accounts payable	3,972	2,512
Accrued liabilities	29,637	33,621
Lease liabilities	6,426	5,816
Deferred revenue	3,597	2,736
Total current liabilities	43,632	44,685
Lease liabilities, non-current	34,868	35,356
Deferred revenue, non-current	144,812	146,195
Total liabilities	223,312	226,236
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, $0.01 par value; 200,000,000 shares authorized as of March 31, 2023 and December 31, 2022; no shares issued and outstanding as of March 31, 2023 and December 31, 2022	0	0
Additional paid-in-capital	873,480	862,359
Accumulated other comprehensive loss	(347)	(701)
Accumulated deficit	(634,135)	(574,826)
Total stockholders’ equity	239,430	287,263
Total liabilities and stockholders’ equity	462,742	513,499
Common Stock Class Undefined
Stockholders' equity:
Common stock, value	295	294
Non-voting Common Stock
Stockholders' equity:
Common stock, value	$ 137	$ 137