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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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