CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash	$ 3,708	$ 3,745
Accounts receivable, net of allowance of $618 and $84, respectively	5,094	4,650
Inventory	254	187
Contract assets	92	189
Prepaid expenses and other current assets	91	151
Total current assets	9,239	8,922
Property, plant and equipment, net	1,853	2,604
Intangibles, net	39	44
Right-of-use operating lease assets	2,180	3,174
Other assets	198	195
Total assets	13,509	14,939
Current liabilities:
Accounts payable and accrued expenses	1,667	1,988
Contract liabilities	478	730
Current portion of PPP loan payable	0	863
Current lease liabilities	1,298	1,261
Total current liabilities	3,443	4,842
PPP loan payable	0	248
Operating lease liability, long-term	918	1,951
Total liabilities	4,361	7,041
Stockholders' equity:
Common stock, $0.001 par value, 24,500,000 shares authorized and 15,756,010 issued	16	16
Additional paid-in capital	73,684	73,638
Treasury stock, 3,517,145 shares, at cost	(2,809)	(2,809)
Accumulated deficit	(61,743)	(62,947)
Total stockholders' equity	9,148	7,898
Total liabilities and stockholders' equity	$ 13,509	$ 14,939