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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2017 and September 30, 2018:

($ 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, 2017 		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
September 30, 2018 
Derivative liabilities related to Warrants $— $— $17,582 $17,582 $— $— $9,767 $9,767 
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 nine months ended September 30, 2018:

($ in thousands)
Description Balance as of
December 31, 2017 		(Gain) or loss
recognized in
earnings from
Change in Fair
Value 		Expiration of
warrants 		Balance as of
September 30, 2018
Derivative liabilities related to Warrants $17,582 $(7,815)$— $9,767