CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 51,762		$ 76,938
Prepaid manufacturing services	6,727		7,315
Prepaid expenses and other current assets	2,744		5,918
Total current assets	61,233		90,171
Property and equipment, net of accumulated depreciation of $14,990 and $11,809	20,538		23,479
Restricted cash	4,170		4,170
Operating right-of-use assets	20,955		21,957
Prepaid manufacturing services, net of current portion	27,500		31,893
Total assets	134,396		171,670
Current liabilities:
Accounts payable	1,956		1,838
Accrued expenses	8,126		9,703
Deferred revenue	1,363		12,963
Operating lease liabilities	3,011		2,661
Total current liabilities	14,456		27,165
Long-term liabilities:
Deferred revenue, net of current portion	17,317		30,686
Note payable, net of discount	25,693		25,430
Derivative liability - warrants	5,428
Operating lease liabilities, net of current portion	32,573		34,884
Total liabilities	95,467		118,165
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized as of September 30, 2022 and December 31, 2021; 36,829,626 and 22,383,830 shares issued and outstanding as of September 30, 2022 and December 31, 2021, respectively	4		2
Additional paid-in capital	398,253		378,750
Accumulated deficit	(359,328)		(325,247)
Total stockholders' equity	38,929	$ 44,398	53,505
Total liabilities and stockholders' equity	$ 134,396		$ 171,670