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Stock-Based Compensation - (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Option Activity
Stock option activity is summarized as follows:
 
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(thousands)
Outstanding at December 31, 2016
1,073,288

 
$
5.26

 
9.4

 
6

Granted
100,000

 
$
2.60

 
—

 
—

Exercised
(18,333
)
 
$
2.25

 
—

 
17

Canceled
(56,335
)
 
$
2.45

 
—

 
—

Vested shares expired
(65,254
)
 
$
33.68

 
—

 
$
—

Outstanding at December 31, 2017
1,033,366

 
$
3.41

 
8.8

 
$
—

Vested and expected to vest at December 31, 2017
1,033,366

 
$
3.41

 
8.8

 
 
Exercisable at December 31, 2017
532,407

 
$
4.33

 
8.5

 
$
—
Schedule of Weighted Average Assumptions and Grant Date Fair Value
The weighted-average assumptions and grant date fair value for the options granted during year ended December 31, 2017 were as follows:
 
Years Ended December 31,
 
2017
 
2016
Expected volatility
121.1
%
 
153.7% - 168.5%

Risk-free interest rate
1.9
%
 
1.19% - 2.18%

Dividend yield
—

 
—

Expected life in years
6.0

 
6.0

Weighted average grant date fair value
$
2.25

 
$
2.12
Schedule of Restricted Stock Unit Activity
RSU activity is as follows:
 
Shares
 
Weighted
Average Grant
Date Fair Value
Nonvested at December 31, 2016
12,389

 
$
10.50

Granted
—

 
$
—

Vested
(6,704
)
 
$
11.77

Forfeited
(4,085
)
 
$
11.80

Nonvested units at December 31, 2017
1,600

 
$
1.85