CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash	$ 2,702	$ 3,676
Accounts receivable, net	6,302	5,929
Employee retention tax credit receivable	650	650
Inventory	252	254
Contract assets	0	352
Prepaid expenses and other current assets	101	103
Total current assets	10,007	10,964
Property, plant and equipment, net	1,867	1,727
Intangibles, net	45	38
Right-of-use operating lease assets	1,538	1,861
Other assets	131	136
Total assets	13,588	14,726
Current liabilities:
Accounts payable and accrued expenses	2,005	2,310
Contract liabilities	177	250
Current lease liabilities	1,314	1,306
Total current liabilities	3,496	3,866
Operating lease liability, long-term	253	588
Total liabilities	3,749	4,454
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, 24,500,000 shares authorized at $0.001 par value, 15,906,010 issued at March 31, 2022 and December 31, 2021	16	16
Additional paid-in capital	73,743	73,686
Treasury stock, 3,870,749 shares at March 31, 2022 and 3,517,145 shares at December 31, 2021, at cost	(3,035)	(2,809)
Accumulated deficit	(60,885)	(60,621)
Total stockholders' equity	9,839	10,272
Total liabilities and stockholders' equity	$ 13,588	$ 14,726