CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012 Scenario, Actual [Member]
Cash flows from operating activities:
Net income	$ 20,024,000	$ 72,226,000
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	16,970,000	20,944,000
(Recovery from) provision for doubtful accounts	140,000	(65,000)
Non-cash provision for restructuring	0	1,459,000
Non-cash provision for allowances for divestiture		0
Gain on divestiture of consumer business	0	(37,972,000)
Gain on sales of assets	(125,000)	(252,000)
Gain on disposal of fixed assets		0
Stock-based compensation	5,716,000	9,025,000
Non-cash interest expense	220,000	220,000
Foreign currency transaction (gains) losses	(856,000)	(1,619,000)
Provision for deferred taxes	6,000	823,000
Changes in operating assets and liabilities, excluding initial effects of acquisitions:
Accounts receivable	12,255,000	29,076,000
Inventories	7,473,000	13,202,000
Prepaid expenses and other current assets	965,000	116,000
Accounts payable	(4,823,000)	(6,247,000)
Accrued expenses, compensation and benefits and other liabilities	(1,348,000)	(1,265,000)
Income taxes payable	(475,000)	711,000
Deferred revenues	(66,170,000)	(67,696,000)
Net cash provided by (used in) operating activities	(10,028,000)	32,686,000
Cash flows from investing activities:
Purchases of property and equipment, net	(8,998,000)	(6,951,000)
Proceeds from sale of assets	125,000	0
Proceeds from divestiture of consumer business	0	11,440,000
Increase in other long-term assets	(25,000)	(73,000)
Net cash (used in) provided by investing activities	(8,898,000)	4,416,000
Cash flows from financing activities:
Proceeds from the issuance of common stock under employee stock plans, net	177,000	794,000
Common stock repurchases for tax withholdings for net settlement of equity awards	(263,000)	(634,000)
Proceeds from revolving credit facilities	0	14,000,000
Payments on revolving credit facilities	0	(14,000,000)
Net cash (used in) provided by financing activities	(86,000)	160,000
Effect of exchange rate changes on cash and cash equivalents	(1,145,000)	1,242,000
Net increase (decrease) in cash and cash equivalents	(20,157,000)	38,504,000
Cash and cash equivalents at beginning of period	70,390,000	32,855,000
Cash and cash equivalents at end of period	50,233,000	71,359,000
Cash paid for income taxes, net of refunds	1,643,000	3,411,000
Cash paid for interest	$ 930,000