Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 24,228	$ 34,946
Marketable securities	128,233	151,663
Prepaid expenses and other current assets	1,420	8,182
Total current assets	153,881	194,791
Property and equipment, net	898	1,567
Operating lease, right-of-use ("ROU") asset	1,776	2,967
Other assets	320	320
Total assets	156,875	199,645
Current liabilities:
Accounts payable	4,090	3,382
Accrued expenses	2,514	11,690
Operating lease obligations, current portion	1,197	1,097
Total current liabilities	7,801	16,169
Operating lease obligations, net of current portion	536	1,838
Total liabilities	8,337	18,007
Commitments and Contingencies
Stockholders' equity:
Common stock, $0.0001 par value: 300,000 shares authorized; 127,668 shares issued and outstanding at December 31, 2023; 126,495 shares issued and 126,302 shares outstanding at December 31, 2022	13	13
Additional paid-in-capital	463,796	454,741
Accumulated other comprehensive income (loss)	37	(302)
Accumulated deficit	(315,308)	(272,814)
Total stockholders' equity	148,538	181,638
Total liabilities and stockholders' equity	$ 156,875	$ 199,645