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ASC 606 Adoption Impact and Revenue from Contracts with Customers - Narrative (Details) - USD ($)		3 Months Ended	6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue recognized that was included in the contract liability balance at January 1, 2018		$ 1,600,000	$ 8,100,000
Contract acquisition costs expensed as incurred amount		$ 500,000	$ 1,000,000
Retained Earnings | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact on opening accumulated deficit from adopting the new accounting standard	$ 24,100,000
Retained Earnings | ASU 2014-09, timing of revenue recognition
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact on opening accumulated deficit from adopting the new accounting standard	1,000,000
Retained Earnings | ASC 340-40
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact on opening accumulated deficit from adopting the new accounting standard	23,100,000
Contract acquisition costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized contract cost amortization period		5 years	5 years
Capitalized contract cost, gross	$ 23,100,000
Amortization of capitalized contract cost		$ 2,000,000	$ 3,900,000
Capitalized contract cost impairment loss			$ 0

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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