Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 123,980	$ 143,940
Restricted cash	449	449
Prepaid expenses and other current assets	4,168	3,479
Assets held for sale	2,000	2,000
Total current assets	130,597	149,868
Restricted cash	2,151	2,151
Property, plant and equipment, net	10,686	10,826
Operating lease right-of-use assets	9,261	9,582
Other non-current assets	304	304
Total assets	152,999	172,731
Current liabilities
Accounts payable	10,380	6,366
Accrued expenses and other current liabilities	13,562	12,284
Deferred revenue	14,695	18,106
Total current liabilities	38,637	36,756
Term loan, net	40,512	40,508
Operating lease liability, net of current portion	18,499	18,953
Other non-current liabilities	1,502	1,577
Total liabilities	99,150	97,794
Commitments and contingencies - Note 13
Stockholders' (deficit) equity
Preferred stock, $0.00001 par value per share; 10,000,000 shares authorized and no shares issued and outstanding as of March 31, 2024 and December 31, 2023
Common stock, $0.00001 par value per share; 400,000,000 shares authorized and 187,018,275 and 186,960,193 issued and outstanding as of March 31, 2024 and December 31, 2023, respectively	2	2
Additional paid-in capital	591,166	587,942
Accumulated other comprehensive loss	(251)
Accumulated deficit	(537,068)	(513,007)
Total stockholders' equity	53,849	74,937
Total liabilities and stockholders' equity	$ 152,999	$ 172,731