Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in Accrued Liabilities Related to Fixed Asset Additions	$ 169
Deferred purchase price consideration related to asset acquisition included in accrued expenses	50
Cash flows from operating activities:
Net income (loss)	(4,885)	$ (2,791)
Adjustments to reconcile net loss to net cash provided by operating activities:
Provision for doubtful accounts	74	403
Depreciation and amortization	2,761	3,189
Deferred income taxes	0	13
Gain (Loss) on Disposition of Property Plant Equipment	3	256
Loss (gain) on derivative instruments	0	(19)
Compensation expense related to stock-based awards and employee stock purchase plan	960	1,052
Foreign Currency Transaction Gain (Loss), Unrealized	12	536
Changes in operating assets and liabilities:
Accounts receivable	4,160	11,516
Inventories	(1,009)	(1,572)
Prepaid expenses and other current assets	(203)	(1,167)
Other non-current assets	(269)	(525)
Accounts payable	1,724	(1,123)
Deferred revenue	454	894
Accrued other	849	(1,986)
Other long-term liabilities	(286)	(38)
Net cash provided by operating activities	4,345	8,638
Cash flows from investing activities:
Capital expenditures	(2,047)	(1,276)
Payments to Acquire Intangible Assets	(50)
Purchases of marketable securities	(1,385)	(2,306)
Maturities and sales of marketable securities	10,354	2,286
Net cash provided by (used in) investing activities	6,872	(1,296)
Cash flows from financing activities:
Repayments of long-term debt	(1,518)	(334)
Repayments of Long-term loan	7,625	1,219
Payments of employee restricted stock withholdings	392	325
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan	1,060	146
Net cash used in financing activities	(8,475)	(1,732)
Effect of exchange rate changes on cash and cash equivalents	221	(131)
Net increase in cash and cash equivalents	2,963	5,479
Cash and cash equivalents at beginning of period	26,422	22,719
Cash and cash equivalents at end of period	$ 29,385	$ 28,198