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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019:

 
 
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, 2018
 
1,018,530

 
$
30.54

 
5.30
 
$
3.3

 
30,000

 
$
5.89

 
4.19
 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Changes during the period:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
209,346

 
4.86

 
 
 
 
 
—

 
—

 
 
 
 
Exercised
 
(240
)
 
3.54

 
 
 
 
 
—

 
—

 
 
 
 
Forfeited
 
(2,610
)
 
4.63

 
 
 
 
 
—

 
—

 
 
 
 
Expired
 
(124,004
)
 
53.68

 
 
 
 
 
—

 
—

 
 
 
 
Outstanding at June 30, 2019
 
1,101,022

 
$
23.12

 
6.25
 
$
—

 
30,000

 
$
5.89

 
3.70
 
$
—

Vested at June 30, 2019
or expected to vest in the future
 
1,076,348

 
$
23.55

 
6.18
 
$
—

 
30,000

 
$
5.89

 
3.70
 
$
—

Vested at June 30, 2019
 
856,547

 
$
28.40

 
5.39
 
$
—

 
30,000

 
$
5.89

 
3.70
 
$
—
Nonvested Restricted Stock Shares Activity [Table Text Block]
During the six months ended June 30, 2019 and 2018, the Company issued restricted stock for services as follows ($ in thousands):

 
 
Six Months Ended June 30,
  
 
2019
 
2018
Number of restricted stock issued
 
123,564

 
127,688

Value of restricted stock issued
 
$
612

 
$
351
Schedule of Restricted Stock
During the six months ended June 30, 2019 and 2018, the Company issued restricted stock units for services as follows ($ in thousands, except share data):
 
Six Months Ended June 30,
 
2019
 
2018
Number of restricted stock units issued
184,454

 
34,988

Value of restricted stock units issued
$
909

 
$
133