Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 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   March 31,
2017		2016
$	434	$	457

The following table summarizes the Company’s stock option activity for the three months ended March 31, 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	2		2.24		1.31
Exercised	(5	)	0.97		0.65
Cancelled/Forfeited	—		—		—
Outstanding, March 31, 2017	8,151		$	2.39	$	1.71

Schedule of Unvested Restricted Stock Activity and Related Compensation Expense

The following table summarizes the Company’s restricted stock activity for the three months ended March 31, 2017: 

	Number of Shares (thousands)		Weighted Average Grant Date Fair Value Per Share
Unvested, December 31, 2016	1,492		$	3.47
Granted	—		—
Vested/Released	(2	)	3.22
Forfeited	—		—
Unvested, March 31, 2017	1,490		$	3.47

The following table summarizes the Company’s stock-based compensation expense related to restricted stock for the periods presented: 

Three Months Ended   March 31,
2017		2016
$	336	$	350

Asset Retirement Obligations

The following table summarizes the Company’s future site restoration obligation transactions for the three months ended March 31, 2017 and the year ended December 31, 2016: 

	March 31, 2017			December 31, 2016
Beginning future site restoration obligation	$	8,623		$	9,679
New wells placed on production and other	34			119
Deletions related to property disposals and plugging costs	—			(1,832		)
Accretion expense	112			491
Revisions and other	(21		)	166
Ending future site restoration obligation	$	8,748		$	8,623