Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (4,253)	$ (4,254)
Loss from discontinued operations		1,713
Loss from continuing operations	(4,253)	(2,541)
Adjustments to reconcile net loss from continuing operations to net cash provided by operating activities:
Depreciation and amortization	2,053	1,628
Equity in loss of partnerships	71	138
Stock-based compensation	1,712	866
Change in allowance for doubtful accounts	273	(499)
Loss on disposal of assets	173
Impairment loss		3,765
Changes in operating assets and liabilities:
Accounts receivable	(260)	1,884
Inventories	(3,151)	(262)
Contract assets	2,126	(1,492)
Other assets	161	798
Accounts payable	(1,366)	(1,166)
Accrued expenses	1,912	(895)
Other liabilities	(959)	(49)
Net cash (used in) provided by operating activities of continuing operations	(1,508)	2,175
Net cash provided by (used in) operating activities of discontinued operations	3	(96)
Net cash (used in) provided by operating activities	(1,505)	2,079
Cash flows from investing activities:
Purchases of machinery and equipment	(1,952)	(2,359)
Payments for acquisition of a business	(7,128)
Payments for acquisition of other assets	(141)	(667)
Purchase of investment securities	(6,159)	(36,688)
Proceeds from sale of investment securities		38,015
Proceeds from maturities of investment securities	15,250	1,750
Investment in partnerships	391
Investment in partnerships		(247)
Net cash provided by (used in) investing activities of continuing operations	261	(196)
Net cash used in investing activities of discontinued operations		(16)
Net cash provided by (used in) investing activities	261	(212)
Cash flows from financing activities:
Payment of financing leases	(57)	(54)
Exercise of stock options and employee stock purchase plan shares	107	189
Withholding of common stock upon vesting of restricted stock units	(246)	(235)
Net cash (used in) financing activities	(196)	(100)
Effect of exchange rate changes on cash	(37)	(13)
Net (decrease) increase in cash	(1,477)	1,754
Cash, cash equivalents and restricted cash, beginning of period	9,162	8,047
Cash, cash equivalents and restricted cash, end of period	7,685	9,801
Non-cash investing and financing:
Acquisition of machinery and equipment in accounts payable	213	297
Acquisition of a business through liabilities incurred	3,705
Acquisition of a business through issuance of common stock	$ 982
Fitting software other asset through liabilities incurred and exchange of investment in partnership		$ 3,093