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Common Stock and Preferred Stock - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 27, 2017
USD ($)
shares
Jan. 31, 2018
USD ($)
ExecutiveOfficers
Director
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
shares
Jun. 30, 2018
USD ($)
ExecutiveOfficers
Director
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Class of Stock [Line Items]                
Cash dividend paid           $ 0 $ 0  
4.25% Convertible Senior Notes (due 2018)                
Class of Stock [Line Items]                
Amount of convertible notes repurchased and retired     $ 12,000,000 $ 12,000,000 $ 39,100,000   12,000,000 $ 6,100,000
Common Stock | 4.25% Convertible Senior Notes (due 2018)                
Class of Stock [Line Items]                
Common stock shares issued upon conversion of debt instrument | shares     112,400 112,400 2,900,000 2,865,000    
Common stock shares issued upon conversion of debt instrument, value     $ 400,000     $ 15,100,000    
Amount of convertible notes repurchased and retired     $ 11,600,000 $ 11,600,000   $ 39,100,000 $ 11,600,000  
Common Stock | Hong Kong Meisheng Cultural Co                
Class of Stock [Line Items]                
Common stock issued, shares | shares 3,660,891              
Common stock issued, value $ 19,300,000              
Executive officer                
Class of Stock [Line Items]                
Restricted stock issued, shares | shares   1,914,894       873,787    
Restricted stock issued, value   $ 4,500,000       $ 4,500,000    
Number of executive officers | ExecutiveOfficers   2       2    
Executive officer | Restricted Stock                
Class of Stock [Line Items]                
Vesting period           3 years    
Non-employee directors                
Class of Stock [Line Items]                
Restricted stock issued, shares | shares   249,480       94,102    
Restricted stock issued, value   $ 600,000       $ 500,000    
Number of non-employee directors | Director   6       5    
Non-employee directors | Hong Kong Meisheng Cultural Co                
Class of Stock [Line Items]                
Restricted stock issued, shares | shares 13,319              
Restricted stock issued, value $ 100,000              
Non-employee directors | Restricted Stock                
Class of Stock [Line Items]                
Shares of restricted stock, vesting date   2019-01       2018-01    
Non-employee directors | Restricted Stock | Hong Kong Meisheng Cultural Co                
Class of Stock [Line Items]                
Shares of restricted stock, vesting date 2018-01