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Deferred Commission (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Capitalized Contract Cost [Line Items]
Deferred commissions	$ 21,200,000		$ 21,200,000		$ 19,300,000
Deferred commissions amortization	$ 3,700,000	$ 2,700,000	7,100,000	$ 5,300,000
Deferred commissions impairment			$ 0	$ 0
Minimum
Capitalized Contract Cost [Line Items]
Sales commissions amortization period			3 years		1 year
Maximum
Capitalized Contract Cost [Line Items]
Sales commissions amortization period			7 years		2 years

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