Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net (loss) income	$ (2,489)	$ (3,777)	$ 5,547
Loss from discontinued operations		1,713	1,215
(Loss) income from continuing operations	(2,489)	(2,064)	6,762
Adjustments to reconcile net (loss) income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	4,622	3,277	2,891
Impairment of goodwill and intangible assets		3,765
Equity in loss of partnerships	125	288	390
Amortization of debt issuance costs			158
Stock-based compensation	2,382	1,886	1,395
Change in fair value of contingent consideration	660
Provision for doubtful accounts	(115)	(482)	475
Loss on disposal of assets	169
Changes in operating assets and liabilities:
Accounts receivable	456	2,769	(3,219)
Inventories	(1,190)	1,609	(5,086)
Contract assets	1,130	(4,613)	(2,645)
Other assets	554	440	(403)
Accounts payable	(2,105)	(3,057)	1,851
Accrued expenses	1,745	(2,077)	(700)
Other liabilities	(331)	(216)	(394)
Net cash provided by operating activities of continuing operations	5,613	1,525	1,475
Net cash provided by (used in) operating activities of discontinued operations	3	(55)	(1,298)
Net cash provided by operating activities	5,616	1,470	177
Cash flows from investing activities:
Purchases of machinery and equipment	(3,629)	(4,593)	(5,503)
Payments for acquisition of a business	(7,128)
Payments for acquisition of intangible assets		(818)
Purchase of investment securities	(19,941)	(43,797)	(38,093)
Proceeds from sale of investment securities		38,015
Proceeds from maturities of investment securities	27,194	11,575
Investment in partnerships		(609)	(1,397)
Net cash used in investing activities of continuing operations	(3,504)	(227)	(44,993)
Net cash used in investing activities of discontinued operations		(15)	(4)
Net cash used in investing activities	(3,504)	(242)	(44,997)
Cash flows from financing activities:
Payment of financing leases	(96)	(111)
Payments for contingent consideration liabilities	(500)
Payments on liabilities for acquisition of intangible assets	(1,387)
Exercise of stock options and employee stock purchase plan shares	237	306	727
Withholding of common stock upon vesting of restricted stock units	(246)	(304)
Proceeds from long-term debt			14,169
Repayments of long-term debt			(25,868)
Payment of debt issuance costs			(88)
Proceeds from issuance of common stock, net of costs			88,967
Payments for repurchase of common stock and related costs			(25,907)
Net cash (used in) provided by financing activities	(1,992)	(109)	52,000
Effect of exchange rate changes on cash	(2)	(4)	(150)
Net increase in cash, cash equivalents and restricted cash	118	1,115	7,030
Cash, cash equivalents and restricted cash, beginning of period	9,162	8,047	1,017
Cash, cash equivalents and restricted cash, end of period	$ 9,280	$ 9,162	$ 8,047