CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 26,375	$ 39,462
Prepaid expenses and other current assets	3,623	3,509
Total current assets	29,998	42,971
Property and equipment, net	17,654	17,290
Other assets	4,142	4,286
Total assets	51,794	64,547
Current liabilities
Accounts payable	1,731	3,172
Accrued expenses and other current liabilities	12,434	13,343
Operating lease obligations	589	574
Current portion of long term debt	1,296	0
Total current liabilities	16,050	17,089
Non-current liabilities
Operating lease obligations, less current portion	3,414	3,567
Long term debt, net	1,533	2,800
Other non-current liabilities	536	527
Total non-current liabilities	5,483	6,894
Total liabilities	21,533	23,983
Commitments and contingencies
Stockholders' equity
Common stock; $0.01 par value; 295,000,000 shares authorized, 257,446,764 and 256,688,304 shares issued, and 257,325,264 and 256,566,804 shares outstanding at March 31, 2024 and December 31, 2023, respectively	2,575	2,567
Treasury stock, at cost, 121,500 shares at March 31, 2024 and December 31, 2023	(48)	(48)
Additional paid-in capital	325,799	324,191
Accumulated other comprehensive income	25	20
Accumulated deficit	(298,091)	(286,167)
Total stockholders' equity	30,261	40,564
Total liabilities and stockholders' equity	51,794	64,547
Series A Preferred Stock
Stockholders' equity
Preferred stock issued	0	0
Series B Preferred Stock
Stockholders' equity
Preferred stock issued	$ 1	$ 1