Acquistions (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 08, 2011
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)	$ 70,284,000				$ 85,043,000				$ 70,284,000	$ 85,043,000
Business Acquisition, Purchase Price Allocation [Abstract]
Total purchase price												119,731,000
Income Statement [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(3,590,000)	(34,324,000)	2,422,000	(4,254,000)	(6,477,000)	(5,493,000)	612,000	(45,000)	(40,884,000)	(12,661,000)	(854,000)
Income Tax Expense (Benefit)									2,590,000	(11,132,000)	(485,000)
Net Income (Loss) Attributable to Parent	(4,855,000)	(35,111,000)	1,307,000	(4,815,000)	(6,651,000)	5,461,000	190,000	(529,000)	(43,474,000)	(1,529,000)	(369,000)
Net income (loss) per share:
Basic	$ (0.18)	$ (1.28)	$ 0.05	$ (0.18)	$ (0.25)	$ 0.21	$ 0.01	$ (0.02)	$ (1.60)	$ (0.06)	$ (0.02)
Diluted	$ (0.18)	$ (1.28)	$ 0.05	$ (0.18)	$ (0.25)	$ 0.19	$ 0.01	$ (0.02)	$ (1.60)	$ (0.06)	$ (0.02)
Weighted Average Number of Shares Outstanding [Abstract]
Basic									27,174,000	25,413,000	24,144,000
Diluted									27,174,000	25,413,000	24,144,000
Statement of Cash Flows [Abstract]
Deferred tax valuation allowance (reversal)									0	(10,350,000)	403,000
Net cash provided by operating activities									5,611,000	14,808,000	16,089,000
Current assets:
Total current assets	125,988,000				147,059,000				125,988,000	147,059,000
Deferred tax assets, net	5,376,000				5,507,000				5,376,000	5,507,000
Goodwill	0				29,748,000				0	29,748,000
Total assets	232,394,000				297,273,000				232,394,000	297,273,000
Current liabilities:
Other accrued liabilities	2,962,000				5,120,000				2,962,000	5,120,000
Total current liabilities	84,101,000				75,851,000				84,101,000	75,851,000
Long-term liabilities:
Other long-term liabilities	4,851,000				9,689,000				4,851,000	9,689,000
Total long-term liabilities	22,851,000				54,689,000				22,851,000	54,689,000
Total liabilities	106,952,000				130,540,000				106,952,000	130,540,000
Shareholders' equity:
Accumulated deficit	(179,686,000)				(136,212,000)				(179,686,000)	(136,212,000)
Total shareholders’ equity	125,442,000				166,733,000				125,442,000	166,733,000
Total liabilities and shareholders' equity	232,394,000				297,273,000				232,394,000	297,273,000
Share Price	$ 2.98								$ 2.98
Contingent Consideration Liability, Current					0					0
Contingent Consideration Liability, Non-Current					7,594,000					7,594,000
Business Acquisition, Purchase Price Adjustment, Additional Deferred Tax Benefit										2,700,000
Continuous Computing [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	81,500,000								81,500,000
Business Acquisition, Purchase Price Allocation [Abstract]
Total purchase price	119,731,000								119,731,000
Cash and cash equivalents	2,214,000								2,214,000
Accounts receivable	13,434,000								13,434,000
Inventories	4,036,000								4,036,000
Prepaid expenses and other current assets	3,316,000								3,316,000
Fixed assets	2,469,000								2,469,000
Other assets	614,000								614,000
Accounts payable	(5,368,000)								(5,368,000)
Accrued expenses	(6,891,000)								(6,891,000)
Deferred revenue	(1,825,000)								(1,825,000)
Other long-term liabilities	(1,226,000)								(1,226,000)
Net assets acquired	10,773,000								10,773,000
Fair value of identifiable intangible assets acquired	89,240,000								89,240,000
Net deferred tax liability	9,870,000								9,870,000
Goodwill	29,588,000								29,588,000
Shareholders' equity:
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares									2,321,016
Business Acquisition, Cost of Acquired Entity, Cash Paid, Aggregate Cash Amount	73,000,000								73,000,000			73,000,000
Business Acquisition, Cost of Acquired Entity, Cash Paid, Working Capital Adjustment	8,500,000								8,500,000			8,500,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Held in Escrow									1,344,444
Business Acquisition, Cost of Acquired Entity, Fair Value at Date of Purchase												30,800,000
Share Price												$ 8.39
Contingent Consideration Liability, Current	836,000								836,000
Contingent Consideration Liability, Non-Current	1,705,000								1,705,000
Business Acquisition, Cost of Acquired Entity, Stock Options Assumed												319,000
ATCA Developed Technology Rights [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	33,600,000								33,600,000
Trillium Developed Technology Rights [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	18,500,000								18,500,000
Software Developed Technology Rights [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	1,850,000								1,850,000
Legacy Developed Technology Rights [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	1,300,000								1,300,000
Developed Technology Rights [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	55,250,000								55,250,000
Customer Relationships [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	25,500,000								25,500,000
Trade Names [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	7,900,000								7,900,000
Order or Production Backlog [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	590,000								590,000
Continuous Computing [Member] | Continuous Computing [Member]
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)	89,240,000								89,240,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
Shareholders' equity:
Contingent Consideration Liability	2,541,000				7,594,000				2,541,000	7,594,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Continuous Computing [Member]
Shareholders' equity:
Contingent Consideration Liability												(7,400,000)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Shareholders' equity:
Contingent Consideration Liability	$ (2,541,000)				$ (7,594,000)				$ (2,541,000)	$ (7,594,000)	$ 0