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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Intake Costs asset
Capitalized Contract Cost [Line Items]
Amortization expense	$ 2,835	$ 2,891	$ 5,514	$ 5,621
Capitalized commissions asset
Capitalized Contract Cost [Line Items]
Amortization expense	$ 5,935	$ 3,793	$ 9,881	$ 7,380

X

- 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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