CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets
Cash	$ 38,696	$ 39,462
Prepaid expenses and other current assets	1,977	3,509
Total current assets	40,673	42,971
Property and equipment, net	17,130	17,290
Restricted cash	305	0
Other assets	3,828	4,286
Total assets	61,936	64,547
Current liabilities
Accounts payable	1,494	3,172
Accrued expenses and other current liabilities	12,475	13,343
Operating lease obligations	477	574
Current portion of long term debt	1,316	0
Total current liabilities	15,762	17,089
Non-current liabilities
Operating lease obligations, less current portion	3,419	3,567
Long term debt, net	1,571	2,800
Other non-current liabilities	554	527
Total non-current liabilities	5,544	6,894
Total liabilities	21,306	23,983
Commitments and contingencies (Note 13)
Stockholders' equity
Convertible preferred stock; $0.01 par value; 10,000,000 shares authorized at September 30, 2024 and December 31, 2023	0	1
Common stock; $0.01 par value; 390,000,000 shares authorized, 290,384,252 and 256,688,304 shares issued, and 290,262,752 and 256,566,804 shares outstanding at September 30, 2024 and December 31, 2023, respectively	2,904	2,567
Treasury stock, at cost, 121,500 shares at September 30, 2024 and December 31, 2023	(48)	(48)
Additional paid-in capital	364,092	324,191
Accumulated other comprehensive income	23	20
Accumulated deficit	(326,341)	(286,167)
Total stockholders' equity	40,630	40,564
Total liabilities and stockholders' equity	$ 61,936	$ 64,547