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Fair value measurements (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2018:

 

Description

 

Balance at

December 31,

2017

 

 

Change in

Fair Value

 

 

Balance at

June 30,

2018

 

Warrant liability

 

$

8,453

 

 

$

(8,155

)

 

$

298