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Subsequent events
6 Months Ended
Jun. 30, 2019
Subsequent Events [Abstract]  
Subsequent Events [Text Block]
12. Subsequent events
 
The Company evaluated subsequent events through the time of the filing of this report on Form 10-Q. Other than as disclosed in these condensed consolidated financial statements, the Company is not aware of any significant events that occurred subsequent to the balance sheet date but prior to the filing of this report that would have a material impact on its condensed consolidated financial statements.