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Equity Investments - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands				3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 01, 2020	Jul. 07, 2017	Jun. 27, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Investment			$ 950			$ 1,190
Joint venture, consideration								$ 60,904
Losses from equity method investment						$ (80)	$ (149)
Bi-PA
Schedule Of Equity Method Investments [Line Items]
Equity investment ownership position				15.00%		15.00%
Impairment on the investment						$ 0	0
Hong Kong JV
Schedule Of Equity Method Investments [Line Items]
Equity investment ownership position				50.00%		50.00%
Losses from equity method investment				$ 42	$ 89	$ 80	149
Investment in joint venture				433	$ 573	433	$ 573
Clean Seed Capital Group Ltd
Schedule Of Equity Method Investments [Line Items]
Joint venture, consideration	$ 1,190
Equity investment ownership position	8.00%
Losses from equity method investment				257		281
Equity Method Investment, Shares Purchased	6,250
Fair value of stock				$ 1,471		$ 1,471
Profeng Australia, Pty Ltd
Schedule Of Equity Method Investments [Line Items]
Joint venture, consideration		$ 1,900

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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