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v3.8.0.1

Deferred Commission (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |
Deferred commissions | $ 20,200,000 |  | $ 19,300,000
Deferred commissions amortization | 3,500,000 | $ 2,600,000 |
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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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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