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Consolidated Balance Sheets - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |
Cash | $ 7,312 | $ 7,924
Accounts receivable, net of allowance for doubtful accounts of $27 and $404, respectively | 9,244 | 9,659
Unbilled receivables | 7,332 | 14,453
Inventories | 701 | 610
Prepaid and other assets | 2,926 | 3,967
Current assets related to discontinued operations | 17 | 22
Total current assets | 27,532 | 36,635
Property and equipment: |  |
Buildings and land | 20,123 | 20,139
Equipment | 22,132 | 22,090
Vehicles | 454 | 457
Leasehold improvements | 23 | 23
Office furniture and equipment | 1,425 | 1,413
Construction-in-progress | 2,227 | 1,569
Total property and equipment | 46,384 | 45,691
Less accumulated depreciation | (28,574) | (27,908)
Net property and equipment | 17,810 | 17,783
Property and equipment related to discontinued operations | 81 | 81
Operating lease right-of-use assets | 2,317 | 2,287
Intangibles and other long term assets: |  |
Permits | 9,118 | 8,922
Other intangible assets - net | 885 | 875
Finite risk sinking fund (restricted cash) | 11,467 | 11,446
Other assets | 849 | 890
Total assets | 70,059 | 78,919
Current liabilities: |  |
Accounts payable | 11,511 | 15,382
Accrued expenses | 5,637 | 6,381
Disposal/transportation accrual | 1,055 | 1,220
Deferred revenue | 3,932 | 4,614
Accrued closure costs - current | 74 | 75
Current portion of long-term debt | 404 | 3,595
Current portion of operating lease liabilities | 275 | 273
Current portion of finance lease liabilities | 433 | 525
Current liabilities related to discontinued operations | 817 | 898
Total current liabilities | 24,138 | 32,963
Accrued closure costs | 6,465 | 6,290
Deferred tax liabilities | 474 | 471
Long-term debt, less current portion | 819 | 3,134
Long-term operating lease liabilities, less current portion | 2,119 | 2,070
Long-term finance lease liabilities, less current portion | 555 | 662
Other long-term liabilities | 626 | 626
Long-term liabilities related to discontinued operations | 256 | 252
Total long-term liabilities | 11,314 | 13,505
Total liabilities | 35,452 | 46,468
Stockholders’ Equity: |  |
Preferred Stock, $.001 par value; 2,000,000 shares authorized, no shares issued and outstanding |  |
Common Stock, $.001 par value; 30,000,000 shares authorized;12,188,256 and 12,161,539 shares issued, respectively;12,180,614 and 12,153,897 shares outstanding, respectively | 12 | 12
Additional paid-in capital | 109,206 | 108,931
Accumulated deficit | (72,555) | (74,455)
Accumulated other comprehensive loss | (167) | (207)
Less Common Stock in treasury, at cost; 7,642 shares | (88) | (88)
Total Perma-Fix Environmental Services, Inc. stockholders’ equity | 36,408 | 34,193
Non-controlling interest | (1,801) | (1,742)
Total stockholders’ equity | 34,607 | 32,451
Total liabilities and stockholders’ equity | $ 70,059 | $ 78,919

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