Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 71,084	$ 88,460
Restricted cash	110	110
Prepaid materials	2,098	1,487
Prepaid expenses and other current assets	1,165	2,162
Total current assets	74,457	92,219
Investment in equity securities	0	1,710
Other assets	1,987	2,323
Total Assets	76,444	96,252
Current liabilities
Accounts payable	679	806
Accrued expenses	919	973
Payroll liabilities	1,862	1,654
Other current liabilities	1,507	1,803
Total current liabilities	4,967	5,236
Total Liabilities	4,967	5,236
Commitments and contingencies (Note 13)
Stockholders' equity
Convertible preferred stock - $0.001 par value; 10,000,000 shares authorized; 582 shares issued and outstanding as of December 31, 2024 and 2023	0	0
Common stock - $0.18 par value; 350,000,000 and 175,000,000 shares authorized as of December 31, 2024 and 2023, respectively; 129,170,004 and 125,304,064 shares issued and outstanding as of December 31, 2024 and 2023, respectively	23,488	22,792
Additional paid-in capital	261,256	255,987
Treasury stock, at cost; 1,320,046 shares of common stock at December 31, 2024 and 2023	(1,475)	(1,475)
Accumulated deficit	(211,792)	(186,288)
Total Stockholders' Equity	71,477	91,016
Total Liabilities and Stockholders' Equity	$ 76,444	$ 96,252