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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Summary of Change in Fair Value of Level 3 Financial Instruments

The following table summarizes the change in fair value of our Level 3 financial instruments for the years ended December 31, 2016, 2015 and 2014 (dollars in thousands).

 

 

 

2016

 

 

2015

 

 

2014

 

Balance, beginning of year

 

$

—

 

 

$

—

 

 

$

1,107

 

Issuances

 

 

—

 

 

 

—

 

 

 

—

 

Change in fair value of derivative liability

 

 

—

 

 

 

—

 

 

 

(635

)

Gain on the extinguishment of derivative liability

 

 

—

 

 

 

—

 

 

 

(472

)

Balance, end of year

 

$

—

 

 

$

—

 

 

$

—