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Commitments and Contingencies (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2017 ft² | Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jan. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Operating leases, rent expense | $ 1,500,000 |  | $ 2,600,000 | $ 2,300,000 | $ 8,800,000 | $ 6,600,000 |
Rentable office space (in sq ft) | ft² |  | 106,230 |  |  |  |  |
Lease liability |  |  | 800,000 |  | 800,000 |  |
Accrual for contingencies |  |  | $ 0 |  | $ 0 |  | $ 0

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- Definition Operating Leases, Net Rentable Area + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + 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=82911808&loc=d3e14326-108349 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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