Other Balance Sheet Items - Prepaid Expenses and Other Current Assets (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) payment	Dec. 31, 2014 USD ($)	Oct. 31, 2014 USD ($)
Prepaid Expense, Current [Abstract]
Prepaid expenses	$ 3,326	$ 2,799
Prepaid registry fees	3,261	1,599
Note receivable	1,010	2,500
Prepaid expenses and other current assets	7,597	$ 6,898
Proceeds from repayment of note receivable	$ 1,500
Namecheap, Inc
Prepaid Expense, Current [Abstract]
Note receivable			$ 2,500
Number of Principal Repayments Received | payment	2
Proceeds from repayment of note receivable	$ 1,500