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Equity Award Plans - Schedule of Stock-based Compensation Awards Granted under Stock Option Plan in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 3,869	$ 4,005	$ 8,481	$ 8,638
Cost of revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	224	342	589	813
Sales and marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	1,732	1,873	3,817	3,939
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	1,090	1,273	2,521	2,858
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	823	517	1,554	1,028
Stock Options [Domain] [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	1,081	1,503	2,181	2,979
Stock awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	3,423	2,130	6,383	4,065
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ (635)	$ 372	$ (83)	$ 1,594
Reallocated 2008 Equity Plan Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Canceled Shares Available for Reallocation			189,016

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Canceled Shares Available for Reallocation

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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