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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |  |
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Aug. 31, 2017 USD ($) | Jun. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Jul. 31, 2013 USD ($) $ / shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Nov. 01, 2018 $ / shares | Jul. 26, 2018 USD ($) | Nov. 07, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Contract assets |  |  |  |  | $ 0 |  |  |  |  |
Contract liabilities |  |  |  |  | 0 |  |  |  |  |
Reserve for sales returns and allowances |  |  |  |  | $ 29,400,000 | $ 17,600,000 |  |  |  |
Sales commissions amortization period (less than) |  |  |  |  | 1 year |  |  |  |  |
Long term debt, face amount |  |  |  |  | $ 140,974,000 | 156,647,000 |  |  |  |
Depreciation expense |  |  |  |  | 12,200,000 | 13,000,000 | $ 13,900,000 |  |  |
Advertising expenses |  |  |  |  | $ 13,700,000 | $ 10,800,000 | $ 20,100,000 |  |  |
Repurchase of common stock under prepaid forward repurchase agreement (in shares) | shares |  | 3,112,840 | 3,112,840 |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Potentially dilutive securities excluded from computation of diluted earnings per common share (in shares) | shares |  |  |  |  | 21,606,816 | 18,272,906 | 23,004,916 |  |  |
Options and warrants |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Potentially dilutive securities excluded from computation of diluted earnings per common share (in shares) | shares |  |  |  |  | 0 | 1,062,500 | 1,500,000 |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Potentially dilutive securities excluded from computation of diluted earnings per common share (in shares) | shares |  |  |  |  | 1,130,233 | 312,663 | 262,510 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Discount on invoiced amount of products |  |  |  |  | 1.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Discount on invoiced amount of products |  |  |  |  | 20.00% |  |  |  |  |
Molds and tools |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment useful life |  |  |  |  | 3 years |  |  |  |  |
Impairment charges |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
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 | $ 21,500,000.0 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 3.25%
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  | $ 100,000,000.0 | $ 0 | $ 21,178,000 |  |  |  |
Debt instrument, interest rate | 4.25% |  |  | 4.25% | 4.25% | 4.25% |  |  | 4.25% |
Debt instrument, conversion price (USD per share) | $ / shares |  |  |  | $ 8.74 |  |  |  |  |  |
Debt conversion ratio |  |  |  | 0.1143674 |  |  |  |  |  |
3.25% Convertible senior notes due in 2020 |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  | $ 27,974,000 | $ 22,469,000 |  |  |  |
Debt instrument, interest rate |  |  |  |  | 3.25% |  |  |  | 3.25% |
3.25% Convertible senior notes due in 2020 | Oasis Management and Oasis Investments ll Master Fund Ltd. |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  |  |  |  |  | $ 8,000,000.0 |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 3.25%
Debt instrument, conversion price (USD per share) | $ / shares |  |  |  |  |  |  |  | $ 2.54 |  |
Debt conversion ratio | 0.3280302 |  |  |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  | $ 28,000,000 |  |  |  |  |
4.875% convertible senior notes (due 2020) |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  | $ 115,000,000 | $ 115,000,000 |  | $ 113,000,000 | 113,000,000 |  |  |  |
Debt instrument, interest rate |  | 4.875% | 4.875% |  | 4.875% |  |  |  |  |
Debt instrument, conversion price (USD per share) | $ / shares |  | $ 9.64 | $ 9.64 |  |  |  |  |  |  |
Debt conversion ratio |  |  | 0.1037613 |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  | $ 93,200,000 | $ 89,700,000 |  |  |  |
Joint Venture With Meisheng Culture & Creative Corp. |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Joint venture, ownership percentage |  |  |  |  | 51.00% |  |  |  |  |

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