CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 14,728,000	$ 21,153,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	17,954,000	22,767,000
(Recovery) provision for doubtful accounts	(143,000)	157,000
Non-cash provision for restructuring	0	0
Gain on sales of assets	0	(125,000)
Gain on divestiture of consumer business	0	0
Stock-based compensation expense	11,513,000	6,917,000
Noncash interest expense	220,000	294,000
Unrealized foreign currency transaction gains	(6,730,000)	(10,000)
Provision for deferred taxes	69,000	730,000
Changes in operating assets and liabilities
Accounts receivable	2,258,000	11,030,000
Inventories	12,122,000	9,021,000
Prepaid expenses and other current assets	(2,130,000)	4,393,000
Accounts payable	947,000	1,416,000
Accrued expenses, compensation and benefits and other liabilities	5,758,000	(8,932,000)
Income taxes payable	(1,090,000)	(1,324,000)
Deferred revenues	51,963,000	91,664,000
Net cash (used in) provided by operating activities	(9,897,000)	(9,145,000)
Cash flows from investing activities:
Purchases of property and equipment	(13,292,000)	(11,625,000)
Capitalized software development costs	(3,400,000)
Change in other long-term assets	(8,000)	(36,000)
Proceeds from divestiture of consumer business	1,500,000	0	11,400,000
Proceeds from sale of assets	0	125,000
Net cash (used in) provided by investing activities	(11,800,000)	(11,536,000)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans, net	252,000	177,000
Common stock repurchases for tax withholdings for net settlement of equity awards	(688,000)	(273,000)
Proceeds from revolving credit facilities	25,500,000	0
Payments on revolving credit facilities	(25,500,000)	0
Net cash (used in) provided by financing activities	(436,000)	(96,000)
Effect of exchange rate changes on cash and cash equivalents	(1,014,000)	(1,410,000)
Net (decrease) increase in cash and cash equivalents	(23,147,000)	(22,187,000)
Cash and cash equivalents at beginning of period	48,203,000	70,390,000
Cash and cash equivalents at end of period	25,056,000	48,203,000	70,390,000
Cash paid for income taxes, net of refunds	2,146,000	2,173,000
Cash paid for interest	1,551,000	1,281,000
Scenario, Actual [Member]
Cash flows from operating activities:
Net income			92,891,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization			27,495,000
(Recovery) provision for doubtful accounts			125,000
Non-cash provision for restructuring			1,459,000
Gain on sales of assets			(252,000)
Gain on divestiture of consumer business			(37,972,000)
Stock-based compensation expense			11,432,000
Noncash interest expense			294,000
Unrealized foreign currency transaction gains			(1,251,000)
Provision for deferred taxes			(400,000)
Changes in operating assets and liabilities
Accounts receivable			26,765,000
Inventories			20,844,000
Prepaid expenses and other current assets			(3,745,000)
Accounts payable			7,111,000
Accrued expenses, compensation and benefits and other liabilities			3,300,000
Income taxes payable			676,000
Deferred revenues			93,241,000
Net cash (used in) provided by operating activities			34,709,000
Cash flows from investing activities:
Purchases of property and equipment			(9,703,000)
Change in other long-term assets			(40,000)
Proceeds from divestiture of consumer business			11,440,000
Proceeds from sale of assets			0
Net cash (used in) provided by investing activities			1,697,000
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans, net			1,022,000
Common stock repurchases for tax withholdings for net settlement of equity awards			(668,000)
Proceeds from revolving credit facilities			14,000,000
Payments on revolving credit facilities			(14,000,000)
Net cash (used in) provided by financing activities			354,000
Effect of exchange rate changes on cash and cash equivalents			775,000
Net (decrease) increase in cash and cash equivalents			37,535,000
Cash and cash equivalents at beginning of period			32,855,000
Cash and cash equivalents at end of period			70,390,000
Cash paid for income taxes, net of refunds			6,554,000
Cash paid for interest			$ 1,224,000