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Summary of Deferred Revenue (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 950 | $ 1,365
Unused Virtual Point |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 724 | 999
Unamortized Virtual Items |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 226 | $ 366

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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