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Common Stock, Preferred Stock and Warrant - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 27, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Oct. 31, 2016
shares
Mar. 31, 2016
USD ($)
shares
Jan. 31, 2016
USD ($)
ExecutiveOfficers
Director
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
ExecutiveOfficers
Director
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
Class of Stock [Line Items]                        
Common stock, shares authorized | shares                 100,000,000 100,000,000    
Preferred shares, shares authorized | shares                 5,000,000 5,000,000    
Total number of shares authorized | shares                 105,000,000      
Common stock, par value | $ / shares                 $ 0.001 $ 0.001    
Preferred shares, par value | $ / shares                 $ 0.001 $ 0.001    
Common stock, shares issued | shares                 26,957,354 19,376,773    
Common stock, shares outstanding | shares                 26,957,354 19,376,773    
Repurchase of common stock, shares | shares           3,112,840            
Repurchase of common stock, average price per share | $ / shares           $ 7.71            
Repurchase of common stock, value           $ 24,000,000            
Repurchase of convertible senior notes                 $ 35,614,000 $ 8,035,000    
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 51,100,000 $ 6,100,000    
Repurchase of convertible senior notes             11,600,000 24,100,000 $ 35,600,000      
4.875% Convertible Senior Notes (due 2020)                        
Class of Stock [Line Items]                        
Amount of convertible notes repurchased and retired         $ 2,000,000              
Common Stock | 4.25% Convertible Senior Notes (due 2018)                        
Class of Stock [Line Items]                        
Amount of convertible notes repurchased and retired   $ 11,600,000         $ 11,600,000 $ 39,100,000        
Common stock shares issued upon conversion of debt instrument | shares   112,400         112,400 2,865,000 3,000,000      
Common stock shares issued upon conversion of debt instrument, value   $ 400,000           $ 15,100,000 $ 15,500,000      
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                      
Securities                        
Class of Stock [Line Items]                        
Retirement of common stock (share) | shares                   1,766,284 1,547,361  
Retirement of common stock                   $ 13,500,000 $ 13,200,000  
Securities | 4.25% Convertible Senior Notes (due 2018)                        
Class of Stock [Line Items]                        
Amount of convertible notes repurchased and retired                   6,100,000    
Repurchase of convertible senior notes                   6,100,000    
Securities | 4.875% Convertible Senior Notes (due 2020)                        
Class of Stock [Line Items]                        
Amount of convertible notes repurchased and retired                   2,000,000    
Repurchase of convertible senior notes                   $ 1,900,000    
Maximum | Restricted Stock                        
Class of Stock [Line Items]                        
Vesting period                 2 years      
Maximum | Securities                        
Class of Stock [Line Items]                        
Stock repurchase, authorized amount                       $ 35,000,000
Executive officer                        
Class of Stock [Line Items]                        
Restricted stock issued, shares | shares       134,058 449,120     873,787        
Restricted stock issued, value       $ 900,000 $ 3,600,000     $ 4,500,000        
Number of executive officers | ExecutiveOfficers         2     2        
Executive officer | Restricted Stock                        
Class of Stock [Line Items]                        
Vesting period       3 years       3 years        
Non-employee directors                        
Class of Stock [Line Items]                        
Restricted stock issued, shares | shares     2,463   62,710     94,102        
Restricted stock issued, value         $ 500,000     $ 500,000        
Number of non-employee directors | Director         5     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     2017-01   2017-01     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