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Condensed financial information of Plastec Technologies, Ltd. - Additional Information (Details) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Common Stock, Par or Stated Value Per Share $ 0.001 $ 0.001
Common Stock, Shares Authorized 100,000,000 100,000,000
Common Stock, Shares, Issued 12,938,128 12,938,128
Common Stock, Shares, Outstanding 12,938,128 12,938,128
Parent Company [Member]    
Condensed Financial Statements, Captions [Line Items]    
Common Stock, Par or Stated Value Per Share $ 0.001 $ 0.001
Common Stock, Shares Authorized 100,000,000 100,000,000
Common Stock, Shares, Issued 12,938,128 12,938,128
Common Stock, Shares, Outstanding 12,938,128 12,938,128