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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Share-based Compensation [Abstract]  
Schedule Share-based Compensation Expense
The following table summarizes the components of share-based compensation expense for the three and nine months ended September 30, 2018 and 2017 (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Research and development
$
32

 
$
—

 
$
413

 
$
208

General and administrative
135

 
62

 
1,869

 
1,674

Discontinued operations
—

 
—

 
—

 
889

Total share-based compensation expense
$
167

 
$
62

 
$
2,282

 
$
2,771

 
 
 
 
 
 
 
 
Schedule of Total Compensation Cost Related to Nonvested Awards
Total compensation cost related to nonvested awards not yet recognized and the weighted-average periods over which the awards were expected to be recognized at September 30, 2018 were as follows (in thousands):
 
Stock Options
 
Restricted Stock
Unrecognized compensation cost
$
685

 
$
—

Expected weighted-average period in years of compensation cost to be recognized
2.57

 
0.00
Schedule of Fair Value of Share-based Compensation Awards
Total fair value of shares vested and the weighted average estimated fair values of shares granted for the nine months ended September 30, 2018 and 2017 were as follows (in thousands):
 
Stock Options
 
Nine Months Ended September 30,
 
2018
 
2017
Total fair value of shares vested
$
218

 
$
5,002

Weighted average estimated fair value of shares granted
$
2.61

 
$
1.72