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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Summary of Changes in Fair Value of Warrants for Preferred Shares

The table below sets forth a summary of the changes in the fair value of the warrants for preferred shares classified as Level 3:

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

Balance at beginning of year

 

$

3,612

 

 

$

872

 

Changes in fair value of warrants for preferred shares

 

 

168

 

 

 

2,740

 

Issuance of warrants for preferred shares

 

 

(3,780

)

 

 

 

Balance at end of year

 

$

 

 

$

3,612