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Common Stock and Preferred Stock - Additional Information (Detail) |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |
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Aug. 09, 2019 USD ($) $ / shares shares | Apr. 27, 2017 USD ($) shares | Jan. 31, 2020 shares | Aug. 31, 2019 shares | Jan. 31, 2019 USD ($) director shares | Jan. 31, 2018 USD ($) director executive_office shares | Jun. 30, 2017 USD ($) shares | Jun. 30, 2014 USD ($) $ / shares shares | Feb. 28, 2017 USD ($) director shares | Jun. 30, 2017 USD ($) shares | Mar. 31, 2017 USD ($) executive_office shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 105,000,000 |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
Preferred shares, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 35,210,371 | 29,169,913 |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 35,210,371 | 29,169,913 |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  | 3,112,840 |  |  |  |  |  |  |
Repurchase of common stock, average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 7.71 |  |  |  |  |  |  |
Repurchase of common stock, value | $ |  |  |  |  |  |  |  | $ 24,000,000 |  |  |  |  |  |  |
Common stock issued (in shares) | 5,853,002 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued, value | $ | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  | $ 4,214,000 |  |  |
Repurchase of convertible senior notes | $ |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 35,614,000 |
Shares vested |  |  |  | 164,166 |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid | $ |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
Preferred stock, shares issued (in shares) | 200,000 |  |  |  |  |  |  |  |  |  |  | 200,000 | 0 |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 0 |  |
Initial value per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |
Preferred stock quarterly dividend rate |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |
Preferred stock accrued dividends | $ |  |  |  |  |  |  |  |  |  |  |  | $ 483,000 | $ 0 |  |
Dividends payable | $ |  |  |  |  |  |  |  |  |  |  |  | $ 483,000 |  |  |
4.25% Convertible Senior Notes Due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument shares common stock issued upon conversion (in shares) |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  |
Amount of convertible notes repurchased and retired | $ |  |  |  |  |  |  | $ 12,000,000 |  |  | $ 12,000,000 | $ 39,100,000 |  |  |  | $ 6,100,000
Repurchase of convertible senior notes | $ |  |  |  |  |  |  | $ 11,600,000 |  |  |  | $ 24,100,000 |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of restricted stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | (42,346) | (29,689) |  |
Restricted stock surrendered, in values | $ |  |  |  |  |  |  |  |  |  |  |  | $ 98,000 | $ 79,000 |  |
Restricted stock vested (in shares) |  |  |  |  |  |  |  |  |  |  |  | 692,464 | 194,800 | 187,224 |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 5,853,000 |  |  |
Common stock issued, value | $ |  |  |  |  |  |  |  |  |  |  |  | $ 6,000 |  |  |
Retirement of restricted stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | (55,000) |  | (9,000) |
Common Stock | 4.25% Convertible Senior Notes Due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument shares common stock issued upon conversion (in shares) |  |  |  |  |  |  | 112,400 |  | 2,865,000 | 112,400 |  |  |  | 3,000,000 |
Common stock shares issued upon conversion of debt instrument, value | $ |  |  |  |  |  |  | $ 400,000 |  | $ 15,100,000 |  |  |  |  | $ 15,500,000 |
Amount of convertible notes repurchased and retired | $ |  |  |  |  |  |  | $ 11,600,000 |  | $ 39,100,000 | $ 11,600,000 |  |  |  |  |
Common Stock | Hong Kong Meisheng Cultural Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  | 3,660,891 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued, value | $ |  | $ 19,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Executive officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  |  |  |  | 3,061,224 | 1,914,894 |  |  | 873,787 |  |  | 190,981 |  |  |
Restricted stock issued, value | $ |  |  |  |  | $ 4,500,000 | $ 4,500,000 |  |  | $ 4,500,000 |  |  | $ 273,000 |  |  |
Number of executive officers |  |  |  |  | 2 | 2 |  |  |  |  | 2 |  |  |  |
Non-employee directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  | 13,319 |  |  | 328,230 | 249,480 |  |  | 94,102 |  |  | 54,704 | 41,580 |  |
Restricted stock issued, value | $ |  | $ 100,000 |  |  | $ 500,000 | $ 600,000 |  |  | $ 500,000 |  |  | $ 100,000 |  |  |
Number of executive officers | director |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |
Number of non-employee directors | director |  |  |  |  |  | 6 |  |  | 5 |  |  |  |  |  |
Non-employee directors | Hong Kong Meisheng Cultural Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  | 13,319 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, value | $ |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding in which, one director may be elected | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage required to change number of directors | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference percent | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability | $ |  |  |  |  |  |  |  |  |  |  |  | 5,247,000 |  |  |
Carrying Amount | Fair Value Measurements, Recurring | Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability | $ | $ 4,900,000 |  |  |  |  |  |  |  |  |  |  | $ 5,200,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion percentage |  |  |  |  |  |  |  |  |  |  |  | 150.00% |  |  |
Subsequent Event | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock vested (in shares) |  |  | 109,360 |  |  |  |  |  |  |  |  |  |  |  |

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