Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ (14,678)	$ (27,581)	$ (49,404)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	18,478	20,240	21,748
Inventory write downs	1,447	2,539	3,302
Deferred income taxes	106	3,106	703
Deferred tax valuation allowance provision	0	0	12,476
Write off of purchased computer software	0	0	2,868
Gain on sale of assets	0	0	(2,303)
Stock-based compensation expense	3,952	4,097	5,298
Other	(217)	119	330
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(17,121)	(2,262)	11,119
Other receivables	(5,040)	(3,689)	(303)
Inventories and deferred cost of sales	(13,801)	4,313	69
Accounts payable	9,853	(1,534)	(6,013)
Accrued wages and bonuses	2,043	(538)	(1,640)
Accrued restructuring	(89)	(2,006)	1,551
Deferred revenue	16,682	(1,875)	(1,057)
Other	3,442	(1,726)	(835)
Net cash provided by (used in) operating activities	5,057	(6,797)	(2,091)
Cash flows from investing activities:
Capital expenditures	(2,224)	(2,396)	(6,047)
Proceeds from sale of software assets	0	200	2,552
Net cash used in investing activities	(2,224)	(2,196)	(3,495)
Cash flows from financing activities:
Payments on line of credit	13,500	0	15,000
Payments on line of credit	(8,500)	(5,000)	0
Repayment of convertible senior notes	(18,000)	0	(16,919)
Proceeds from issuance of common stock	331	21,186	806
Other financing activities	(142)	(882)	(921)
Net cash provided by (used in) financing activities	(12,811)	15,304	(2,034)
Effect of exchange rate changes on cash	(500)	(551)	(80)
Net increase (decrease) in cash and cash equivalents	(10,478)	5,760	(7,700)
Cash and cash equivalents, beginning of period	31,242	25,482	33,182
Cash and cash equivalents, end of period	20,764	31,242	25,482
Supplemental disclosure of cash flow information:
Interest	835	1,207	1,090
Income taxes	$ 1,289	$ 1,532	$ 1,415