Basic and Diluted Net IncomePer Share Earnings (Loss) Per Share Calculation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (26,015,000)	[1]	$ (12,720,000)	[1]	$ (4,112,000)	[1]	$ (6,557,000)	[1]	$ (4,855,000)	[1]	$ (35,111,000)	[1]	$ 1,307,000	[1]	$ (4,815,000)	[1]	$ (49,404,000)	$ (43,474,000)	$ (1,529,000)	[2]
Interest on convertible notes, net of tax benefit																	0	0	0
Net loss, diluted																	$ (49,404,000)	$ (43,474,000)	$ (1,529,000)
Weighted average shares used to calculate net loss per share, basic																	28,805	27,174	25,413	[2]
Effect of escrow shares (in shares)																	0	0	0
Effect of convertible notes (in shares)																	0	0	0
Weighted average shares used to calculate net income (loss) per share, diluted																	28,805	27,174	25,413	[2]
Basic (in dollars per share)	$ (0.89)		$ (0.44)		$ (0.14)		$ (0.23)		$ (0.18)		$ (1.28)		$ 0.05		$ (0.18)		$ (1.72)	$ (1.60)	$ (0.06)	[2]
Diluted (in dollars per share)	$ (0.89)		$ (0.44)		$ (0.14)		$ (0.23)		$ (0.18)		$ (1.28)		$ 0.05		$ (0.18)		$ (1.72)	$ (1.60)	$ (0.06)	[2]
Total equity award shares excluded																	3,993	3,082	3,410
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards (in shares)																	0	0	0
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards (in shares)																	0	0	0
Contingent Consideration Classified as Equity [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Total equity award shares excluded																	0	700	1,300

[1] The comparability of our income (loss) from operations and net income (loss) per share was affected by the following unusual income or expense items:•During the fourth quarter of 2013, the Company incurred a $12.5 million loss associated with the establishment of a valuation allowance against certain of the Company's foreign deferred tax assets.•During the first quarter of 2013, the Company recorded a $2.9 million loss associated to the write off of the Company's Security Gateway ("SEG") purchased computer software due to management's decision to abandon future development of this technology.•During the first quarter of 2013, the Company recorded a $1.5 million gain associated with the the sale of the Company's OS-9 software assets.•The balance of goodwill was determined to be impaired during the third quarter of 2012, resulting in an impairment charge of $29.7 million. In addition, the Company recorded a $5.9 million gain associated with a decrease in fair value of the contingent consideration related to our acquisition of Continuous Computing.

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