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Commitments and Contingencies - Additional Information (Detail) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 20, 2017 ft² Option | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2020 ft²
Commitments And Contingencies [Line Items] |  |  |  |  |
Rent expense charged to operations |  | $ 5.6 | $ 4.9 | $ 5.0 |
Current Headquarters [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Lease agreement expires, date | Apr. 30, 2025 |  |  |  |
Number of options to extend term of the lease | Option | 2 |  |  |  |
Lease extension period, number of years | 5 years |  |  |  |
Incentives received upon execution of amendment |  | 3.2 |  |  |
Incentives Owed Upon Expansion of Square Footage |  | $ 2.1 |  |  |
Current Headquarters [Member] | Minneapolis, Minnesota [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Current leased space for headquarters | ft² | 189,000 |  |  |  |
Current Headquarters [Member] | Scenario, Forecast [Member] | Minneapolis, Minnesota [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Future expansion of headquarters premises | ft² |  |  |  |  | 25,000

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- Definition Additional area of lease space. + References No definition available. + Details
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- Definition Area of leased space. + References No definition available. + Details
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Balance Type: | na
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- Definition Commitments and Contingencies. + References No definition available. + Details
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- Definition Incentives owed upon expansion of square footage. + References No definition available. + Details
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- Definition Incentives received upon execution of amendment. + References No definition available. + Details
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- Definition Number of options to extend term of lease. + References No definition available. + Details
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X
- 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 Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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