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Summary of Significant Accounting Policies - Amortization Expense Associated with Commissions Asset and Intake Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Intake Costs asset |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization expense | $ 2,250 | $ 2,294 | $ 7,764 | $ 7,915
Capitalized commissions asset |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization expense | $ 4,224 | $ 3,053 | $ 14,105 | $ 10,433

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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/disclosureRef -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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