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Fair value measurement (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Warrants A summary of the change in fair value of warrant conversion liability is as follows for the period ended June 30, 2019:
Warrant Conversion Liability
Balance December 31, 2018$363  
Warrants issued—  
Unrealized loss on warrant conversion liability437  
Balance June 30, 2019$800