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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of liabilities that are measured and recognized at fair value on a recurring basis
The following table presents the Company’s liabilities that are measured and recognized at fair value on a recurring basis classified under the appropriate level of the fair value hierarchy as of December 31, 2016 and December 31, 2017:

($ in thousands)
Description
 
Quoted Prices
in
Active
Markets
for Identical
Assets and
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Balance as of
December 31, 2016
 
Quoted Prices
in
Active
Markets
for Identical
Assets and
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Balance as of
December 31, 2017
Derivative liabilities related to Warrants
 
$
—

 
$
—

 
$
216

 
$
216

 
$
—

 
$
—

 
$
17,582

 
$
17,582
Summary of changes in the fair value of Level 3 liabilities
The following table sets forth a summary of changes in the fair value of the Company’s Level 3 liabilities for the year ended December 31, 2017 and December 31, 2016:

($ in thousands)
Description
 
Balance as of December 31, 2015
 
(Gain) or loss
recognized in
earning from
Change in Fair
Value
 
Balance as of
December 31, 2016
 
Fair Value of warrants upon issuance
 
(Gain) or loss
recognized in
earning from
Change in Fair
Value
 
Balance as of
December 31, 2017
Derivative liabilities related to Warrants
 
$
322

 
$
(106
)
 
$
216

 
$
21,706

 
$
(4,340
)
 
$
17,582