Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash	$ 20,981	$ 14,816
Accounts receivable and unbilled revenues, net	1,941	1,448
Inventory	3,851	3,827
Prepaid expenses and other current assets	648	707
Total current assets	27,421	20,798
Property and equipment, net	284	282
Operating lease right-of-use assets, net	103	118
Total assets	27,808	21,198
Current liabilities:
Accounts payable	314	334
Accrued payroll and employee benefits	870	951
Accrued expenses	464	200
Contract liabilities	31	36
Current portion of finance lease obligations	73	95
Current portion of operating lease obligations	85	83
Total current liabilities	1,837	1,699
Finance lease obligations, net of current portion	41	46
Operating lease obligations, net of current portion	18	35
Total liabilities	1,896	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 March 31, 2023 and December 31, 2022, respectively	15	14
Additional paid-in capital	235,118	227,235
Accumulated other comprehensive loss	(305)	(340)
Accumulated deficit	(208,916)	(207,491)
Total stockholders’ equity	25,912	19,418
Total liabilities and stockholders’ equity	$ 27,808	$ 21,198