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- 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