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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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