Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 242,159	$ 133,359
Marketable securities	55,517	58,685
Prepaid expenses and other current assets	1,854	2,193
Total current assets	299,530	194,237
Property and equipment, net	7,615	7,742
Right-of-use assets	60,949	63,492
Restricted cash	5,031	5,031
Long-term deposit and other assets	1,746	1,647
Total assets	374,871	272,149
Current liabilities:
Accounts payable	3,110	2,374
Accrued expenses and other current liabilities	10,808	10,716
Operating lease liability, current portion	3,614	3,246
Deferred revenue, current portion	10,704	10,137
Current portion of long-term debt	10,336	3,347
Total current liabilities	38,572	29,820
Deferred revenue, net of current portion	3,955	5,622
Operating lease liability, net of current portion	57,011	59,140
Long-term debt and accrued interest	20,112	26,700
Total liabilities	119,650	121,282
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding at June 30, 2024 and December 31, 2023	0	0
Additional paid-in capital	564,615	398,459
Accumulated deficit	(309,400)	(247,597)
Total stockholders' equity	255,221	150,867
Total liabilities and stockholders' equity	374,871	272,149
Voting Common Stock
Stockholders' equity:
Common stock	5	4
Non-voting Common Stock
Stockholders' equity:
Common stock	$ 1	$ 1