Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net (loss) income	$ (64)	$ (2,489)
Adjustments to reconcile net loss from continuing operations to net cash provided by operating activities:
Depreciation and amortization	5,541	4,622
Equity in loss of partnership	210	125
Stock-based compensation	2,184	2,382
Change in fair value of contingent consideration	(739)	660
Provision for doubtful accounts	(141)	(115)
Loss on disposal of assets	18	169
Changes in operating assets and liabilities:
Accounts receivable	2,034	456
Inventories	(4,907)	(1,190)
Contract assets	(2,348)	1,130
Other assets	(3,412)	554
Accounts payable	583	(2,105)
Accrued expenses	2,314	1,745
Other liabilities	(835)	(331)
Net cash provided by operating activities of continuing operations	438	5,613
Net cash provided by operating activities of discontinued operations	0	3
Net cash provided by operating activities	438	5,616
Cash flows from investing activities:
Purchases of property, plant and equipment	(2,504)	(3,629)
Payments for acquisition of a business	0	(7,128)
Payments for acquisition of intangible assets	(221)	0
Purchase of investment securities	(24,763)	(19,941)
Proceeds from maturities of investment securities	25,422	27,194
Investment in partnership	(158)	0
Net cash used in investing activities	(2,224)	(3,504)
Cash flows from financing activities:
Payment of financing leases	(23)	(96)
Payments for contingent consideration liabilities	(1,052)	(500)
Payments on liabilities for acquisition of intangible assets	(204)	(1,387)
Exercise of stock options and employee stock purchase plan shares	471	237
Withholding of common stock upon vesting of restricted stock units	(344)	(246)
Net cash used in financing activities	(1,152)	(1,992)
Effect of exchange rate changes on cash	(113)	(2)
(Decrease) increase in cash and cash equivalents	(3,051)	118
Cash and cash equivalents, beginning of period	9,280	9,162
Cash and cash equivalents, end of period	$ 6,229	$ 9,280