Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 20,291	$ 14,816
Accounts receivable and unbilled revenues, net	1,301	1,448
Inventory	3,671	3,827
Prepaid expenses and other current assets	660	707
Total current assets	25,923	20,798
Property and equipment, net	289	282
Operating lease right-of-use assets, net	83	118
Total assets	26,295	21,198
Current liabilities:
Accounts payable	508	334
Accrued payroll and employee benefits	848	951
Accrued expenses	468	200
Contract liabilities	22	36
Current portion of finance lease obligations	54	95
Current portion of operating lease obligations	66	83
Total current liabilities	1,966	1,699
Finance lease obligations, net of current portion	31	46
Operating lease obligations, net of current portion	17	35
Total liabilities	2,014	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 June 30, 2023 and December 31, 2022, respectively	15	14
Additional paid-in capital	235,135	227,235
Accumulated other comprehensive loss	(446)	(340)
Accumulated deficit	(210,423)	(207,491)
Total stockholders’ equity	24,281	19,418
Total liabilities and stockholders’ equity	$ 26,295	$ 21,198