Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 18,471	$ 14,816
Accounts receivable and unbilled revenues, net	928	1,448
Inventory	4,309	3,827
Prepaid expenses and other current assets	755	707
Total current assets	24,463	20,798
Property and equipment, net	288	282
Operating lease right-of-use assets, net	66	118
Total assets	24,817	21,198
Current liabilities:
Accounts payable	510	334
Accrued payroll and employee benefits	743	951
Accrued expenses	431	200
Contract liabilities	28	36
Current portion of finance lease obligations	35	95
Current portion of operating lease obligations	66	83
Total current liabilities	1,813	1,699
Finance lease obligations, net of current portion	24	46
Operating lease obligations, net of current portion		35
Total liabilities	1,837	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 September 30, 2023 and December 31, 2022, respectively	15	14
Additional paid-in capital	235,148	227,235
Accumulated other comprehensive loss	(494)	(340)
Accumulated deficit	(211,689)	(207,491)
Total stockholders’ equity	22,980	19,418
Total liabilities and stockholders’ equity	$ 24,817	$ 21,198