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Fair value measurements (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table sets forth a summary of changes in the fair value of level 3 liabilities measured at fair value on a recurring basis for the nine months ended September 30, 2019:

 

Description  

Balance at

December 31,

2018

   

Change in

Fair Value

   

Balance at

September 30, 2019

 
Warrant liability   $ 67     $ (67 )   $  
                         

 

 

The following table sets forth a summary of changes in the fair value of level 3 liabilities measured at fair value on a recurring basis for the year ended December 31, 2018:  

 

Description  

Balance at

December 31,

2017

     

Change in

Fair Value

     

Balance at

December 31,

2018

 
Warrant liability   $ 8,453       $ (8,386 )     $ 67