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Description of the Business and Summary of Significant Accounting Policies - Deferred Commissions, Net (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Capitalized Contract Cost [Line Items] |  |  |  |  |
Additional contract costs deferred | $ 11,200,000 | $ 6,400,000 | $ 19,000,000.0 | $ 13,700,000 |
Deferred contract costs, amortization period | 5 years |  | 5 years |  |
Amortization of deferred commissions | $ 5,700,000 | 4,200,000 | $ 10,800,000 | 8,100,000 |
Impairment loss related to deferred costs | 0 | $ 0 | 0 | $ 0 |
Deferred Commissions | Prepaid Expenses and Other Current Assets |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Deferred contract costs | 24,900,000 |  | 24,900,000 |  | $ 19,900,000
Deferred Commissions | Other Assets |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Deferred contract costs | $ 46,700,000 |  | $ 46,700,000 |  | $ 43,500,000

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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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