Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 74,015	$ 155,384
Available-for-sale securities	49,625	58,338
Prepaid expenses and other current assets	6,094	5,916
Total current assets	129,734	219,638
Operating lease, right-of-use asset	26,539	28,949
Property and equipment, net	6,624	9,657
Other non-current assets	209	175
Restricted cash	1,833	1,833
Total assets	164,939	260,252
Current liabilities:
Accounts payable	2,032	3,238
Accrued expenses	10,137	16,691
Operating lease liabilities	1,855	1,897
Finance lease liabilities	469	668
Other current liabilities	24	14
Total current liabilities	14,517	22,508
Operating lease liabilities, excluding current portion	22,707	24,279
Finance lease obligations, excluding current portion	1,234	1,703
Other non-current liabilities		96
Total liabilities	38,458	48,586
Commitments and Contingencies (Note 12)
Stockholders’ Equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at December 31, 2023 and December 31, 2022; no shares issued and outstanding at December 31, 2023 and December 31, 2022
Common stock, $0.001 par value; 60,000,000 shares authorized at December 31, 2023 and December 31, 2022; 20,386,606 shares issued and outstanding at December 31, 2023 and 19,556,732 shares issued and outstanding at December 31, 2022	20	20
Additional paid-in capital	785,199	774,452
Accumulated other comprehensive income (loss)	15	(68)
Accumulated deficit	(658,753)	(562,738)
Total stockholders' equity	126,481	211,666
Total liabilities and stockholders' equity	$ 164,939	$ 260,252