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v3.19.1

- Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 | Jan. 31, 2016 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future grant (in shares) |  |  |  | 1,157,210 |
Executive officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years | 3 years |  |  |
Recognition Technology in Connection with Toy Products |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of stock warrants granted to third party in connection with acquisition |  |  |  |  | 1,500,000
Exercise price of warrants |  |  |  |  | $ 16.28
Warrants exercisable term |  |  |  |  | 5 years
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation, non-vested restricted stock awards |  |  |  | $ 2,900 |
Unrecognized compensation, non-vested restricted stock awards expected recognized period |  |  |  | 872 days |
Restricted Stock | Non-employee directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock grants |  |  |  | $ 100 |
Restricted Stock | Executive officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years |  | 3 years |  |
Restricted Stock | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 1 year |
Restricted Stock | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 2 years |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 4 years |
Unrecognized compensation, non-vested restricted stock awards |  |  |  | $ 1,900 |
Unrecognized compensation, non-vested restricted stock awards expected recognized period |  |  |  | 1 year 9 months 26 days |

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