Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 16,155	$ 14,816
Accounts receivable and unbilled revenues, net	917	1,448
Inventory	610	3,827
Prepaid expenses and other current assets	938	707
Total current assets	18,620	20,798
Property and equipment, net	340	282
Operating lease right-of-use assets, net	54	118
Total assets	19,014	21,198
Current liabilities:
Accounts payable	440	334
Accrued payroll and employee benefits	941	951
Accrued expenses	354	200
Contract liabilities	10	36
Current portion of finance lease obligations	33	95
Current portion of operating lease obligations	54	83
Total current liabilities	1,832	1,699
Finance lease obligations, net of current portion	19	46
Operating lease obligations, net of current portion		35
Total liabilities	1,851	1,780
Commitments and contingencies
Stockholders’ equity:
Common stock, 25,000,000 shares authorized, with par value of $0.001; 15,359,481 and 14,455,765 shares issued and outstanding at December 31, 2023 and 2022, respectively	15	14
Additional paid-in capital	235,158	227,235
Accumulated other comprehensive loss	(396)	(340)
Accumulated deficit	(217,614)	(207,491)
Total stockholders’ equity	17,163	19,418
Total liabilities and stockholders’ equity	$ 19,014	$ 21,198