Acquistions (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Taxes					$ 2,700,000
Income Statement [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(34,738,000)		(5,618,000)		(37,123,000)		(6,052,000)
Income Tax Expense (Benefit)	373,000		(11,079,000)	[1]	1,496,000		(11,174,000)	[1]
Net Income (Loss) Attributable to Parent	(35,111,000)		5,461,000		(38,619,000)		5,122,000	[2]
Net income (loss) per share:
Basic	$ (1.28)		$ 0.21	[1]	$ (1.43)		$ 0.20	[1]
Diluted	$ (1.28)	[3],[4]	$ 0.19	[1],[3],[4]	$ (1.43)	[3],[4]	$ 0.20	[1],[3],[4]
Weighted Average Number of Shares Outstanding [Abstract]
Basic	27,534		26,432		26,985		25,038
Diluted	27,534		31,657	[1]	26,985		25,595
Statement of Cash Flows [Abstract]
Deferred tax valuation allowance reversal					0		(10,253,000)	[2]
Net cash provided by operating activities					2,629,000		13,915,000
Current assets:
Total current assets	125,454,000				125,454,000				147,059,000	[2]
Deferred tax assets, net	4,922,000				4,922,000				5,507,000
Goodwill	0				0				29,748,000
Total assets	237,033,000				237,033,000				297,273,000	[2]
Current liabilities:
Other accrued liabilities	10,681,000				10,681,000				16,195,000
Total current liabilities	85,595,000				85,595,000				76,479,000	[2]
Long-term liabilities:
Other long-term liabilities	3,912,000				3,912,000				9,061,000
Total long-term liabilities	21,912,000				21,912,000				54,061,000	[2]
Total liabilities	107,507,000				107,507,000				130,540,000	[2]
Shareholders' equity:
Accumulated deficit	(174,831,000)				(174,831,000)				(136,212,000)
Total shareholders’ equity	129,526,000				129,526,000				166,733,000	[2]
Total liabilities and shareholders' equity	237,033,000				237,033,000				297,273,000	[2]
Continuous Computing [Member]
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
Scenario, Previously Reported [Member]
Income Statement [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest			(5,618,000)				(6,052,000)
Income Tax Expense (Benefit)			(8,383,000)				(8,478,000)
Net Income (Loss) Attributable to Parent			2,765,000				2,426,000
Net income (loss) per share:
Basic			$ 0.10				$ 0.10
Diluted			$ 0.10				$ 0.09
Weighted Average Number of Shares Outstanding [Abstract]
Basic			26,432				25,038
Diluted			27,820				25,595
Statement of Cash Flows [Abstract]
Deferred tax valuation allowance reversal							(7,557,000)
Net cash provided by operating activities							13,915,000
Current assets:
Total current assets									147,427,000
Deferred tax assets, net									5,875,000
Goodwill									26,599,000
Total assets									294,492,000
Current liabilities:
Other accrued liabilities									16,106,000
Total current liabilities									76,390,000
Long-term liabilities:
Other long-term liabilities									9,065,000
Total long-term liabilities									54,065,000
Total liabilities									130,455,000
Shareholders' equity:
Accumulated deficit									(138,908,000)
Total shareholders’ equity									164,037,000
Total liabilities and shareholders' equity									294,492,000
Purchase Price Allocation Adjustments [Member] | Continuous Computing [Member]
Income Statement [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest			0				0
Income Tax Expense (Benefit)			(2,696,000)				(2,696,000)
Net Income (Loss) Attributable to Parent			2,696,000				2,696,000
Net income (loss) per share:
Basic			$ 0.11				$ 0.10
Diluted			$ 0.09				$ 0.11
Weighted Average Number of Shares Outstanding [Abstract]
Basic			0				0
Diluted			3,837				0
Statement of Cash Flows [Abstract]
Deferred tax valuation allowance reversal							(2,696,000)
Net cash provided by operating activities							0
Current assets:
Total current assets									(368,000)
Deferred tax assets, net									(368,000)
Goodwill									3,149,000
Total assets									2,781,000
Current liabilities:
Other accrued liabilities									89,000
Total current liabilities									89,000
Long-term liabilities:
Other long-term liabilities									(4,000)
Total long-term liabilities									(4,000)
Total liabilities									85,000
Shareholders' equity:
Accumulated deficit									2,696,000
Total shareholders’ equity									2,696,000
Total liabilities and shareholders' equity									$ 2,781,000

[1] As adjusted to reflect the impact of additional tax-related adjustments to the Company's purchase accounting for Continuous Computing in accordance with ASC 805-10 "Business Combinations." See Note 2 — Acquisitions for additional information

[2] (A)As adjusted to reflect the impact of additional tax-related adjustments to the Company's purchase accounting for Continuous Computing in accordance with ASC 805-10 "Business Combinations." See Note 2 — Acquisitions for additional information.

[3] For the three and nine months ended September 30, 2012, the 0.8 million and 1.1 million contingently issuable shares were excluded from the calculation as their effect would have been anti-dilutive.

[4] For the three and nine months ended September 30, 2012 and the nine months ended September 30, 2011, 3.8 million and 3.6 million as-if converted shares associated with the Company's 2013 and 2015 convertible senior notes were excluded from the calculation as their effect would have been anti-dilutive