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Stock-Based Compensation - (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Details of Fair Value Option Award
The fair market value of the stock options at the date of grant was estimated using the Black-Scholes option-pricing model with the following weighted average assumptions for the years ended December 31:
 
2018
 
2017
Expected life (1)
6 years

 
5 years, 11 months

Interest rate
2.6
%
 
1.9
%
Dividend yield
—

 
—

Volatility
88.0
%
 
88.7
%
(1)
The Company uses the simplified method for estimating the stock option term.
Summary of Stock Option Activity
The following table summarizes stock option activity for the years ended December 31, 2018 and 2017:
($ in thousands, except share and per share data)
 
Number of shares
 
Weighted-
average 
exercise 
price
 
Weighted-
average
 remaining 
contractual term
 (in years)
 
Aggregate 
intrinsic 
value
Outstanding at December 31, 2016
 
255,906

 
$
75.84

 
7 years, 2 months
 
$
—

Granted
 
59,000

 
14.41

 
 
 
 

Expired
 
(42,360
)
 
106.73

 
 
 
 
Forfeited
 
(54,620
)
 
47.51

 
 
 
 

Outstanding at December 31, 2017
 
217,926

 
$
60.31

 
7 years, 3 months
 
$
—

Granted
 
84,800

 
2.99

 
 
 
 

Expired
 
(3,825
)
 
34.07

 
 
 
 
Forfeited
 
(12,189
)
 
6.26

 
 
 
 

Outstanding at December 31, 2018 (1)
 
286,712

 
$
46.01

 
7 years
 
$
—

Exercisable at December 31, 2018
 
166,871

 
$
73.25

 
5 years, 9 months
 
$
—

 
(1)
Includes both vested stock options as well as unvested stock options for which the requisite Company service period has not been rendered but that are expected to vest based on achievement of reaching the Company service period requirement.