Related Party Transactions - Additional Information (Detail) - USD ($)		1 Months Ended				2 Months Ended	12 Months Ended
	Apr. 27, 2017	Jul. 31, 2018	Jan. 31, 2018	Oct. 31, 2016	Jan. 31, 2016	Feb. 28, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 26, 2018	Nov. 07, 2017	Aug. 31, 2017	Jul. 31, 2013
Related Party Transaction [Line Items]
Net income (loss) attributable to non-controlling interests							$ (57,000)	$ 57,000	$ 6,000
Long term debt, face amount							140,974,000	156,647,000
3.25% Convertible senior notes due in 2020
Related Party Transaction [Line Items]
Long term debt, face amount							$ 27,974,000	22,469,000
Debt instrument, interest rate							3.25%				3.25%
4.25% Convertible Senior Notes (due 2018)
Related Party Transaction [Line Items]
Long term debt, face amount							$ 0	$ 21,178,000						$ 100,000,000.0
Debt instrument, interest rate							4.25%	4.25%			4.25%		4.25%	4.25%
Non-employee directors
Related Party Transaction [Line Items]
Restricted stock issued (in shares)	13,319		249,480	2,463	62,710	94,102	41,580
Restricted stock issued, value	$ 100,000		$ 600,000		$ 500,000	$ 500,000	$ 100,000
Hong Kong Meisheng Cultural Co
Related Party Transaction [Line Items]
Net income (loss) attributable to non-controlling interests									0
Hong Kong Meisheng Cultural Co | Minimum
Related Party Transaction [Line Items]
Ownership percentage	10.00%
Hong Kong Meisheng Cultural Co | Non-employee directors
Related Party Transaction [Line Items]
Restricted stock issued (in shares)	13,319
Restricted stock issued, value	$ 100,000
Related Party Transactions
Related Party Transaction [Line Items]
Legal fees and expenses							1,300,000	$ 2,200,000	3,200,000
Legal fees and reimbursable expense, payable							$ 200,000	500,000
Nantworks
Related Party Transaction [Line Items]
Ownership percentage							8.50%
Due to related party										$ 1,200,000
Renewal fee paid										800,000
Renewal fee payable, each period										$ 200,000
Related party, receivable							$ 0	0
Rent expense including common area maintenance and parking							$ 0	0	0
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible senior notes due in 2020
Related Party Transaction [Line Items]
Long term debt, face amount											$ 8,000,000.0
Debt instrument, interest rate												3.25%
Common stock shares issued upon conversion of debt instrument, value		$ 8,000,000
China Joint Venture
Related Party Transaction [Line Items]
Percentage of ownership interest in joint venture							51.00%
Net income (loss) attributable to non-controlling interests							$ (57,000)	57,000	$ 6,000
Joint venture, ownership percentage							51.00%
Hong Kong Meisheng Cultural Co
Related Party Transaction [Line Items]
Net income (loss) attributable to non-controlling interests							$ 0	0
Joint venture, ownership percentage				50.00%
Hong Kong Meisheng Cultural Co | Minimum
Related Party Transaction [Line Items]
Ownership percentage	10.00%
Hong Kong Meisheng Cultural Co | Affiliated Entity
Related Party Transaction [Line Items]
Due to related party							3,600,000	3,300,000
Inventory related payments made to related party							36,200,000	35,100,000
Hong Kong Affiliate, China Joint Venture Partner | Affiliated Entity
Related Party Transaction [Line Items]
Common stock issued (in shares)	3,660,891
Common stock issued, value	$ 19,300,000
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible senior notes due in 2020
Related Party Transaction [Line Items]
Long term debt, face amount							$ 29,500,000	$ 21,500,000			$ 8,000,000		$ 21,500,000
Oasis Management and Oasis Investments ll Master Fund Ltd. | 4.25% Convertible Senior Notes (due 2018)
Related Party Transaction [Line Items]
Debt instrument, interest rate													4.25%