Balance Sheet Components (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Accrued expenses and other current liabilities
Accrued bonuses, commissions and wages	$ 7,640	$ 7,640	$ 12,321
Accrued ESPP	2,207	2,207	3,278
Accrued vacation	2,758	2,758	2,202
Accrued marketing expenses	1,662	1,662	1,062
Accrued legal, consulting and audit fees	317	317	672
Accrued employee expense reimbursements	497	497	643
Accrued sales taxes and other taxes	351	351	638
Liability payable for unvested stock options exercises	347	347	552
Accrued sales awards	428	428	320
Accrued other	1,632	1,632	1,367
Total	17,839	17,839	23,055
Changes in accumulated other comprehensive income
Beginning balance		198
Other comprehensive income before reclassifications		65
Other comprehensive income attributable to redeemable non-controlling interests	(20)	(18)
Ending balance	245	245
Foreign Currency Translation Adjustments
Changes in accumulated other comprehensive income
Beginning balance		198
Other comprehensive income before reclassifications		65
Other comprehensive income attributable to redeemable non-controlling interests		(18)
Ending balance	$ 245	$ 245