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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 1,868 | $ 4,295
Accounts receivable, net | 40,162 | 32,242
Assets from derivative contracts | 813 | 8,559
Prepaids and other | 1,195 | 2,740
Total current assets | 44,038 | 47,836
Oil and natural gas properties (full cost method): |  |
Evaluated | 550,522 | 509,274
Unevaluated | 76,136 | 75,494
Gross oil and natural gas properties | 626,658 | 584,768
Less - accumulated depletion | (327,233) | (295,163)
Net oil and natural gas properties | 299,425 | 289,605
Other operating property and equipment: |  |
Other operating property and equipment | 3,106 | 3,535
Less - accumulated depreciation | (1,012) | (1,149)
Net other operating property and equipment | 2,094 | 2,386
Other noncurrent assets: |  |
Assets from derivative contracts | 110 | 4,009
Operating lease right of use assets | 811 | 310
Other assets | 2,737 | 2,351
Total assets | 349,215 | 346,497
Current liabilities: |  |
Accounts payable and accrued liabilities | 60,403 | 58,928
Liabilities from derivative contracts | 74,287 | 22,125
Current portion of long-term debt | 149 | 1,720
Operating lease liabilities | 365 | 403
Total current liabilities | 135,204 | 83,176
Long-term debt | 155,000 | 158,489
Other noncurrent liabilities: |  |
Liabilities from derivative contracts | 9,536 | 4,291
Asset retirement obligations | 11,786 | 10,583
Operating lease liabilities | 446 |
Commitments and contingencies (Note 10) |  |
Stockholders' equity: |  |
Common stock: 100,000,000 shares of $0.0001 par value authorized;16,273,913 and 16,203,979 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively | 2 | 2
Additional paid-in capital | 331,660 | 330,123
Retained earnings (accumulated deficit) | (294,419) | (240,167)
Total stockholders' equity | 37,243 | 89,958
Total liabilities and stockholders' equity | $ 349,215 | $ 346,497

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