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v3.20.2

Revenue - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Category | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Revenue [Line Items] |  |  |  |  |
Number of categories | Category |  |  | 3 |  |
Remaining performance obligations | $ 0 |  | $ 0 |  |
Recognized revenue | 2,400,000 | $ 3,600,000 | 8,100,000 | $ 10,500,000 |
Other Than Maintenance Services |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Remaining performance obligations | $ 16,000,000.0 |  | $ 16,000,000.0 |  | $ 13,600,000

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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