Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net loss	$ (7,852,000)	$ (28,000)	$ (10,449,000)
Loss from discontinued operations	1,000	113,000	3,914,000
Net income (loss) from continuing operations	(7,851,000)	85,000	(6,535,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	810,000	654,000	1,312,000
Amortization	186,000	193,000	215,000
(Gain) loss on disposal of equipment	(3,000)	142,000	304,000
Provision for doubtful accounts, net of recoveries	421,000	(64,000)	0
Deferred income taxes	0	2,000	(534,000)
Stock-based compensation, net of forfeitures	574,000	233,000	1,389,000
Intangible assets abandonment and building impairment	127,000	317,000	2,965,000
Excess and obsolete inventory provision	(131,000)	78,000	228,000
Changes in operating assets and liabilities:
Accounts receivable	11,415,000	848,000	113,000
Inventories	818,000	(108,000)	(134,000)
Prepaid expenses, other current assets and other non-current assets	2,239,000	251,000	(1,084,000)
Accounts payable	(7,331,000)	521,000	2,500,000
Accrued liabilities and other non-current liabilities	(5,010,000)	1,897,000	(2,439,000)
Net cash provided by (used in) operating activities - continuing operations	(3,366,000)	5,049,000	(1,700,000)
Net cash used in operating activities - discontinued operations	(21,000)	(122,000)	(1,868,000)
Net cash provided by (used in) operating activities	(3,387,000)	4,927,000	(3,568,000)
INVESTING ACTIVITIES
Purchases of equipment and patents	(550,000)	(570,000)	(492,000)
Proceeds from the sale of equipment	0	1,000	2,000
Net cash used in investing activities - continued operations	(550,000)	(569,000)	(490,000)
Net cash provided by investing activities - discontinued operations	505,000	0	0
Net cash used in investing activities	(45,000)	(569,000)	(490,000)
FINANCING ACTIVITIES
Taxes paid on behalf of equity award participants	(128,000)	(12,000)	(258,000)
Net cash used in financing activities	(128,000)	(12,000)	(258,000)
Effect of exchange rate fluctuations on cash	(998,000)	(673,000)	856,000
Net increase (decrease) in cash, cash equivalents and restricted cash	(4,558,000)	3,673,000	(3,460,000)
Cash, cash equivalents and restricted cash at beginning of period	18,059,000	14,386,000	17,846,000
Cash, cash equivalents and restricted cash at end of period	13,501,000	18,059,000	14,386,000
Cash paid for:
Interest	0	0	0
Income taxes paid	$ 18,000	$ 27,000	$ 31,000