Credit Facility - Additional Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Line Of Credit Facility [Line Items]
Percentage of equity pledged in international subsidiaries as collateral	65.00%
Silicon Valley Bank | Revolving Line of Credit
Line Of Credit Facility [Line Items]
Credit facility	$ 20.0
Line of credit outstanding amount	0	20.0
Percentage of interest rate above the prime rate	2.00%
Silicon Valley Bank | Equipment Line of Credit
Line Of Credit Facility [Line Items]
Credit facility	10.0
Line of credit outstanding amount	$ 7.7	$ 3.8
Credit facility interest rate	2.50%
Credit facility, outstanding balance payable period	30 months
Credit facility, frequency of payment and payment terms	The outstanding balance as of September 14, 2014 will be payable in equal monthly installments for 30 months thereafter, with the last payment due on March 14, 2017.
Percentage of final payment on principal amount	4.00%