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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Abstract] |  |  |  |
Cash equivalents maturity period |  | 3 months |  |
Short-term investments maturity period |  | 90 days |  |
Period of royalties notification, minimum |  | 30 days |  |
Period of royalties notification, maximum |  | 45 days |  |
Advertising expense |  | $ 221 | $ 102 | $ 265
Period of maturities, money market and highly liquid debt |  | 90 days |  |
Pro Forma | Accounting Standards Update 2014-09 |  |  |  |
Item Effected [Line Items] |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (5,200) |  |  |

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- Definition The maximum amount of period of time that royalty agreements generally require licensees to give notification of royalties from the end of a quarter. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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