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Common Stock and Preferred Stock - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 27, 2017 USD ($) shares | Jan. 31, 2018 USD ($) ExecutiveOfficers Director shares | Jun. 30, 2017 USD ($) shares | Sep. 30, 2017 USD ($) shares | Mar. 31, 2017 USD ($) shares | Sep. 30, 2018 USD ($) ExecutiveOfficers Director shares | Sep. 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 | $ 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 |  |  | $ 39,100,000 |  |
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 |  |  |  |  |  |  |

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