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Additional Information-Financial Statement Schedule I Condensed Financial Information of Parent Company - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2019
Condensed Financial Statements, Captions [Line Items]
Par value of ordinary shares	$ 2
Retrospective adjustment to addition paid-in capital for subscription receivable	2
Before adjustment
Condensed Financial Statements, Captions [Line Items]
Par value of ordinary shares	16
Subscription receivable	$ 16
Parent
Condensed Financial Statements, Captions [Line Items]
Par value of ordinary shares		$ 2
Subscription receivable		0
Retrospective adjustment to addition paid-in capital for subscription receivable		2
Parent | Before adjustment
Condensed Financial Statements, Captions [Line Items]
Par value of ordinary shares		16
Subscription receivable		$ 16
Parent | KAG
Condensed Financial Statements, Captions [Line Items]
Percentage of issued and outstanding shares acquired			100.00%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Value of all classes of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares exclude common shares repurchased by the entity and held as treasury shares.

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Note received instead of cash as contribution to equity. The transaction may be a sale of capital stock or a contribution to paid-in capital.

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