Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net (loss)	$ (17,388,000)	$ (12,380,000)	$ (17,725,000)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	1,780,000	2,067,000	1,922,000
Amortization	1,720,000	2,138,000	2,384,000
Loss (gain) on disposal of equipment	60,000	(26,000)	0
Allowance for doubtful accounts	(111,000)	0	762,000
Deferred income taxes	1,196,000	4,916,000	(9,524,000)
Stock compensation expense	1,991,000	1,809,000	2,322,000
Goodwill and intangible assets impairment	2,074,000	1,425,000	23,400,000
Excess and obsolete inventory reserve	825,000	0	0
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	3,522,000	7,880,000	6,117,000
Inventories	446,000	(560,000)	(616,000)
Prepaid expenses, other current assets and other noncurrent assets	2,893,000	(1,245,000)	(913,000)
Accounts payable	(2,445,000)	1,817,000	(3,600,000)
Accrued liabilities and other noncurrent liabilities	699,000	(913,000)	906,000
Net cash (used in) provided by operating activities	(2,738,000)	6,928,000	5,435,000
INVESTING ACTIVITIES
Purchases of property, equipment and patents	(940,000)	(802,000)	(2,808,000)
Proceeds from the sale of equipment	2,000	26,000	0
Purchases of other intangible assets	0	0	(3,010,000)
Payment for acquisitions, net of cash acquired	0	0	(8,079,000)
Net cash used in investing activities	(938,000)	(776,000)	(13,897,000)
FINANCING ACTIVITIES
Payments on short-term borrowings	0	(1,623,000)	0
Proceeds from exercises of stock options	0	0	297,000
Excess tax benefit from exercises of stock options	0	0	7,000
Change in restricted cash	(6,020,000)	0	0
Treasury shares withheld	(172,000)	(252,000)	(304,000)
Net cash used in financing activities	(6,192,000)	(1,875,000)	0
Effect of exchange rate fluctuations on cash	10,000	(1,230,000)	(639,000)
Net (decrease) increase in cash and cash equivalents	(9,858,000)	3,047,000	(9,101,000)
Cash and cash equivalents at beginning of year	21,684,000	18,637,000	27,738,000
Cash and cash equivalents at end of year	11,826,000	21,684,000	18,637,000
Cash paid for:
Interest	0	27,000	125,000
Income taxes paid	$ 368,000	$ 0	$ 0