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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Stock Option Activity
The following table summarizes the activity for stock options and warrants for the six months ended June 30, 2018:

 
 
Stock Options
 
Warrants
 
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value (In Thousands)
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value (In Thousands)
Outstanding at December 31, 2017
 
1,072,499

 
$
33.50

 
4.76
 
$
0.1

 
209,818

 
$
53.20

 
0.95
 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Changes during the period:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
144,310

 
3.80

 
 
 
 
 
—

 
—

 
 
 
 
Exercised
 
(74,622
)
 
4.60

 
 
 
 
 
—

 
—

 
 
 
 
Forfeited
 
(3,030
)
 
3.80

 
 
 
 
 
—

 
—

 
 
 
 
Expired
 
(65,941
)
 
24.50

 
 
 
 
 
(161,164
)
 
50.30

 
 
 
 
Outstanding at June 30, 2018
 
1,073,216

 
$
31.50

 
5.42
 
$
1,237.5

 
48,654

 
$
59.84

 
2.95
 
$
17.4

Vested at June 30, 2018
or expected to vest in the future
 
1,061,160

 
$
31.80

 
5.37
 
$
1,205.7

 
48,654

 
$
59.84

 
2.95
 
$
17.4

Vested at June 30, 2018
 
963,497

 
$
34.60

 
4.95
 
$
950.5

 
48,654

 
$
59.84

 
2.95
 
$
17.4
Schedule of Restricted Stock
During the six months ended June 30, 2018 and 2017, the Company issued restricted stock for services as follows ($ in thousands):

 
 
Six Months Ended June 30,
  
 
2018
 
2017
Number of restricted stock issued
 
127,688

 
132,726

Value of restricted stock issued
 
$
351

 
$
470