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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue: |  |  |
Oil | $ 9,047 | $ 28,331 | $ 31,214
Natural gas and liquids | 1,249 | 4,048 | 2,433
Total revenue | 10,296 | 32,379 | 33,647
Oil and gas operations: |  |  |
Production costs | 7,352 | 10,638 | 10,469
Depreciation, depletion and amortization | 8,412 | $ 14,685 | 13,623
Impairment of oil and gas properties | 57,676 |  | 5,828
General and administrative: |  |  |
Compensation and benefits, including directors | 2,602 | $ 4,124 | 3,073
Stock-based compensation | 948 | $ 527 | $ 384
Employee severance costs | 504 |  |
Professional fees, insurance and other | 1,866 | $ 1,785 | $ 1,945
Total operating expenses | 79,360 | 31,759 | 35,322
Operating income (loss) | (69,064) | 620 | (1,675)
Other income (expense): |  |  |
Realized gain (loss) on oil price risk derivatives | (75) | 316 | (338)
Unrealized gain (loss) on oil price risk derivatives | 1,634 | 266 | (737)
Gain on sale of assets | 121 | $ 112 | 760
Loss on investments | (68) |  | (2,264)
Rental and other income | 431 | $ 88 | 168
Interest expense | (263) | (385) | (429)
Total other income (expense) | 1,780 | 397 | (2,840)
Income (loss) from continuing operations | (67,284) | 1,017 | (4,515)
Discontinued operations: |  |  |
Discontinued operations | (2,992) | $ (3,108) | (2,744)
Impairment loss on discontinued operations | (22,620) |  | (120)
Loss from discontinued operations | (25,612) | $ (3,108) | (2,864)
Net loss | (92,896) | (2,091) | (7,379)
Change in fair value of marketable equity securities | 56 | (44) | (113)
Comprehensive loss | $ (92,840) | $ (2,135) | $ (7,492)
Earnings (loss) per share- basic |  |  |
Continuing operations (in dollars per share) | $ (2.40) | $ 0.04 | $ (0.16)
Discontinued operations (in dollars per share) | (0.91) | (0.12) | (0.11)
Total (in dollars per share) | (3.31) | (0.08) | (0.27)
Earnings (loss) per share- diluted |  |  |
Continuing operations (in dollars per share) | (2.40) | 0.04 | (0.16)
Discontinued operations (in dollars per share) | (0.91) | (0.11) | (0.11)
Total (in dollars per share) | $ (3.31) | $ (0.07) | $ (0.27)
Weighted average shares outstanding |  |  |
Basic (in shares) | 28,065,000 | 27,833,000 | 27,679,000
Diluted (in shares) | 28,065,000 | 28,099,000 | 27,679,000

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