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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Commitments and Contingencies Disclosure [Line Items] |  |
Rental expense | $ 5.4 | $ 3.6
General and Administrative Expense |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Accrued expenses on settlement of case | 1.0 |
Rental expense | 2.2 | 1.9
Fulfilment Expense |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Rental expense | $ 3.2 | $ 1.7

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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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