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Liquidity - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	May 09, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents including restricted cash		$ 47,405	$ 58,205	$ 46,779	$ 64,977
Foreign Subsidiaries
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents including restricted cash		23,900	$ 33,900
Wells Fargo
Cash and Cash Equivalents [Line Items]
Off-balance sheet letters of credit		$ 12,800
Scenario, Forecast | Subsequent Event | Hong Kong Meisheng Cultural Co
Cash and Cash Equivalents [Line Items]
Potential equity infusion	$ 50,000
Potential ownership interest after equity infusion	51.00%

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