CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 198,053	$ 19,238
Prepaid expenses and other current assets	4,464	1,352
Total current assets	202,517	20,590
Restricted cash	1,553	1,551
Property and equipment, net	7,620	7,367
Operating lease right-of-use asset	5,977	6,309
Other non-current assets	393	500
Total assets	218,060	36,317
Current liabilities
Accounts payable	3,144	5,444
Accrued expenses	8,751	13,732
Operating lease liability, current portion	801	564
Notes payable, current portion		2,333
Other current liabilities	82	82
Total current liabilities	12,778	22,155
Notes payable, net of current portion	9,628	7,412
Operating lease liability, net of current portion	10,107	10,908
Other liabilities, long-term	118	1,127
Total liabilities	32,631	41,602
Commitments and contingencies (Note 8)
Convertible preferred stock (Series A, A-1, A-2(A), A-2(A-1), B and C), $0.0001 par value, no shares authorized and no shares issued and outstanding at December 31, 2021; 133,602,056 shares authorized and 66,788,528 shares issued and outstanding at December 31, 2020; aggregate liquidation preference of $0 and $80,250 at December 31, 2021 and December 31, 2020, respectively		78,002
Stockholders' equity (deficit)
Preferred stock, $0.0001 par value; 5,000,000 shares authorized, no shares issued or outstanding at December 31, 2021; no shares authorized, issued or outstanding at December 31, 2020
Common stock, $0.0001 par value; 200,000,000 shares authorized, 27,468,950 shares issued and 27,358,375 shares outstanding at December 31, 2021; 126,000,000 shares authorized, 973,898 shares issued and 689,929 shares outstanding at December 31, 2020	3
Additional paid-in capital	346,312	1,799
Accumulated deficit	(160,886)	(85,086)
Total stockholders' equity (deficit)	185,429	(83,287)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	$ 218,060	$ 36,317