RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS Adjustments to Condensed Consolidated Statement of Cash Flows (Details) (USD $)	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2012 Restatement Adjustment [Member]	Jun. 30, 2012 Other Adjustment [Member]	Jun. 30, 2012 Discontinued Operations [Member]	Jun. 30, 2012 Scenario, Actual [Member]	Jun. 30, 2012 Scenario, Previously Reported [Member]
Net (loss) income	$ 17,442,000		$ 61,157,000	$ 595,000	$ 9,951,000	$ 19,478,000	$ (52,225,000)
Depreciation and amortization	11,800,000		0	(1,668,000)	0	14,516,000	16,184,000
(Recovery from) provision for doubtful accounts	30,000		0	(34,000)	0	(96,000)	(62,000)
Non-cash provision for restructuring			0	(2,633,000)	0	0	2,633,000
Non-cash provision for allowances related to divestitures			0	(2,848,000)	0	0	2,848,000
Gain on sales of assets	(125,000)		0	(4,000)	0	(252,000)	256,000
Loss on divestiture			0	0	(9,951,000)	0	9,951,000
Stock-based compensation expense	4,185,000		0	2,031,000	0	7,405,000	5,374,000
Non-cash interest expense	147,000		0	74,000	0	147,000	73,000
Foreign currency transaction gains	(84,000)		0	971,000	0	(1,819,000)	848,000
Provision for deferred taxes	9,000		0	0	0	823,000	(823,000)
Accounts receivable	12,277,000		3,230,000	(3,175,000)	0	12,262,000	(12,317,000)
Inventories	5,896,000		0	(1,671,000)	0	22,638,000	(20,967,000)
Prepaid expenses and other current assets	1,225,000		0	(1,075,000)	0	(1,242,000)	2,317,000
Accounts payable	(6,661,000)		0	0	0	(3,531,000)	(3,531,000)
Accrued expenses, compensation and benefits and other liabilities	(6,516,000)		0	(144,000)	0	4,916,000	5,060,000
Income taxes payable	(680,000)		0	104,000	0	2,274,000	2,170,000
Deferred revenues	(44,501,000)		(57,927,000)	0	0	(44,756,000)	13,171,000
Net cash provided by operating activities	(5,556,000)	(9,145,000)	0	431,000	0	32,763,000	32,332,000
Purchases of property and equipment	(5,290,000)		0	(214,000)	0	(5,023,000)	5,237,000
Increase in other long-term assets	(18,000)		0	(131,000)	0	(30,000)	161,000
Proceeds from sale of assets	125,000					0
Net cash used in investing activities	(5,183,000)		0	345,000	0	(5,053,000)	(5,398,000)
Proceeds from the issuance of common stock under employee stock plans, net	177,000		0	493,000	0	573,000	80,000
Common stock repurchases for tax withholdings for net settlement of equity awards	232,000		0	(493,000)	0	493,000	0
Proceeds from revolving credit facilities	0		0	0	0	1,000,000	1,000,000
Payments on revolving credit facilities	0		0	0	0	(1,000,000)	1,000,000
Net cash provided by financing activities	(55,000)		0	0	0	80,000	80,000
Effect of Exchange Rate on Cash and Cash Equivalents	(3,492,000)		0	(776,000)	0	(1,262,000)	(486,000)
Net decrease in cash and cash equivalents	(14,286,000)		0	0	0	26,528,000	26,528,000
Cash and Cash Equivalents, at Carrying Value	$ 56,104,000	$ 48,203,000	$ 0	$ 0	$ 0	$ 59,383,000	$ 59,383,000