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Basis of Presentation (Tables)
 6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Stock Options Activity and Related Compensation Expense
The following table summarizes the Company’s stock-based compensation expense related to stock options for the periods presented: 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
$
635

 
$
479

 
$
1,069

 
$
936

 
 
    

The following table summarizes the Company’s stock option activity for the six months ended June 30, 2017 (shares in thousands): 
 
 
 
Number
of
Shares
 
Weighted
Average
 Option
 Exercise
 Price Per
 Share
 
Weighted
 Average
Grant
Date Fair
 Value
Per Share
 
Outstanding, December 31, 2016
 
8,154

 
$
2.39

 
$
1.70

 
Granted
 
207

 
1.88

 
1.23

 
Exercised
 
(5
)
 
0.97

 
0.65

 
Forfeited
 
(2
)
 
3.01

 
2.14

 
Outstanding, June 30, 2017
 
8,354

 
$
2.38

 
$
1.69

 
    
Schedule of Unvested Restricted Stock Activity and Related Compensation Expense
The following table summarizes the Company’s restricted stock activity for the six months ended June 30, 2017: 
 
 
Number
of
Shares (thousands)
 
Weighted
Average
Grant Date
Fair Value
Per Share
 
Unvested, December 31, 2016
 
1,492

 
$
3.47

 
Granted 
 
4

 
2.06

 
Vested/Released                                                 
 
(2
)
 
3.25

 
Forfeited                                                 
 
(1
)
 
2.63

 
Unvested, June 30, 2017
 
1,493

 
$
3.46

 

The following table summarizes the Company’s stock-based compensation expense related to restricted stock for the periods presented: 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
$
344

 
$
356

 
$
680

 
$
707

 
Asset Retirement Obligations
The following table summarizes the Company’s future site restoration obligation transactions for the six months ended June 30, 2017 and the year ended December 31, 2016: 
 
 
June 30, 2017
 
December 31,
2016
 
Beginning future site restoration obligation
 
$
8,623

 
$
9,679

 
New wells placed on production and other
 
102

 
119

 
Deletions related to property disposals and plugging costs
 
(77
)
 
(1,832
)
 
Accretion expense
 
224

 
491

 
Revisions and other
 
(33
)
 
166

 
Ending future site restoration obligation
 
$
8,839

 
$
8,623