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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2014 | Jul. 31, 2013 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 31, 2016 | Sep. 30, 2012
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  |  |  |  | $ 156,647,000 | $ 156,647,000 | $ 206,865,000 |  |  |
Long term debt, current |  |  |  |  |  |  |  | 21,200,000 | 21,200,000 |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  | 13,000,000 | 13,900,000 | $ 10,900,000 |  |
Advertising expenses |  |  |  |  |  |  |  |  | 10,800,000 | 20,100,000 | 15,800,000 |  |
Impairment charge |  |  |  |  |  |  |  |  | 5,248,000 | 0 | 0 |  |
Goodwill impairment |  |  |  |  | $ 8,300,000 |  |  |  | 8,288,000 | 0 |  |  |
Restricted stock compensation expense |  |  |  |  |  |  |  |  | $ 3,112,000 | 1,621,000 | 1,562,000 |  |
Prepaid forward contract, settlement year |  |  |  |  |  |  |  |  | 2020 |  |  |  |
Payment for repurchase of convertible notes |  |  |  |  |  |  |  |  | $ 35,614,000 | 8,035,000 |  |  |
Repurchase of common stock under prepaid forward repurchase agreement, shares |  |  | 3,112,840 |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, average price per share |  |  | $ 7.71 |  |  |  |  |  |  |  |  |  |
Payment for repurchase of common stock |  |  | $ 24,000,000 |  |  |  |  |  |  | $ 13,506,000 | $ 13,193,000 |  |
Trademarks and Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Potentially dilutive securities excluded from computation of diluted earnings per common share |  |  |  |  |  |  |  |  | 18,272,906 | 23,004,916 | 0 |  |
Options and Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Potentially dilutive securities excluded from computation of diluted earnings per common share |  |  |  |  |  |  |  |  | 1,062,500 | 1,500,000 | 1,518,596 |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Potentially dilutive securities excluded from computation of diluted earnings per common share |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount on invoiced amount of products |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount on invoiced amount of products |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Molds and tools |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment useful life |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  | $ 100,000,000 |  |  |  | $ 22,469,000 | $ 22,469,000 |  |  |  |
Debt instrument, interest rate |  |  |  | 4.25% |  |  |  | 4.25% | 4.25% | 4.25% |  |  |
Debt instrument, maturity date |  |  |  | Aug. 01, 2018 |  |  |  |  | Nov. 01, 2020 |  |  |  |
Conversion rate in share per $1000 principal amount of notes |  |  |  | 114.3674 |  |  |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  |  |  | $ 20,500,000 | $ 20,500,000 | $ 18,900,000 |  |  |
Debt instrument, maturity year |  |  |  |  |  |  |  |  | 2018 | 2018 |  |  |
Frequency of interest payment |  |  |  |  |  |  |  |  | Semi-annually |  |  |  |
Debt instrument, conversion rate |  |  |  | $ 8.74 |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  | $ 12,000,000 |  |  |  | $ 12,000,000 | $ 39,100,000 | 51,100,000 | $ 51,100,000 | $ 6,100,000 |  |  |
Payment for repurchase of convertible notes |  |  |  |  |  | 11,600,000 | 24,100,000 |  | $ 35,600,000 |  |  |  |
4.25% Convertible Senior Notes (due 2018) | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  | $ 11,600,000 |  |  |  | $ 11,600,000 | $ 39,100,000 |  |  |  |  |  |
Debt instrument shares common stock issued upon conversion |  | 112,400 |  |  |  | 112,400 | 2,865,000 |  | 3,000,000 |  |  |  |
4.875% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  | $ 115,000,000 |  |  |  |  | $ 113,000,000 | $ 113,000,000 | $ 113,000,000 |  |  |
Debt instrument, interest rate |  |  | 4.875% |  |  |  |  | 4.875% | 4.875% | 4.875% |  |  |
Debt instrument, maturity date |  |  | Jun. 01, 2020 |  |  |  |  |  |  |  |  |  |
Conversion rate in share per $1000 principal amount of notes |  |  | 103.7613 |  |  |  |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  |  |  | $ 89,700,000 | $ 89,700,000 | $ 89,300,000 |  |  |
Debt instrument, maturity year |  |  |  |  |  |  |  |  | 2020 | 2020 |  |  |
Frequency of interest payment |  |  |  |  |  |  |  | semi-annually | Semi-annually |  |  |  |
Debt instrument, conversion rate |  |  | $ 9.64 |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |
Net proceeds from debt instrument |  |  | $ 110,400,000 |  |  |  |  |  |  |  |  |  |
3.25% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  |  |  |  | $ 21,178,000 | $ 21,178,000 | $ 93,865,000 |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 3.25% | 3.25% | 3.25% |  |  |
Debt instrument, maturity year |  |  |  |  |  |  |  |  | 2020 | 2020 |  |  |
Debt instrument, conversion rate |  |  |  |  |  |  |  | $ 3.05 | $ 3.05 |  |  |  |
3.25% Convertible Senior Notes (due 2020) | Oasis Management and Oasis Investments ll Master Fund Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount | $ 21,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | Nov. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate in share per $1000 principal amount of notes | 328.0302 |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  |  |  | $ 22,500,000 | $ 22,500,000 |  |  |  |
After Modification Senior Notes (due 2018) | Oasis Management and Oasis Investments ll Master Fund Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount | $ 21,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | Nov. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate in share per $1000 principal amount of notes | 328.0302 |  |  |  |  |  |  |  |  |  |  |  |
China Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  |  |  |  |  |  | 51.00% | 51.00% |  |  |  |
DreamPlay Toys |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
DreamPlay Toys | Technology Rights |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |  |

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