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Lawsuits and complaints (Details Textual)
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of lawsuits and complaints [Line Items]  
Term at which Department of Justice agreed not to prosecute those charges against Company 3 years
External monitor, term 24 months
Aforementioned Amounts $ 30,500,000
Department of Justice [Member]  
Disclosure of lawsuits and complaints [Line Items]  
Legal proceedings, amount agreed to pay 15,487,500
Securities Exchange Commission [Member]  
Disclosure of lawsuits and complaints [Line Items]  
Legal proceedings, amount agreed to pay $ 15,000,000