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Consolidated Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets: |  |  |
Cash |  | $ 7,924 | $ 390
Accounts receivable, net of allowance for doubtful accounts of $404 and $487, respectively |  | 9,659 | 13,178
Unbilled receivables |  | 14,453 | 7,984
Inventories |  | 610 | 487
Prepaid and other assets |  | 3,967 | 2,983
Current assets related to discontinued operations |  | 22 | 104
Total current assets |  | 36,635 | 25,126
Property and equipment: |  |  |
Buildings and land |  | 20,139 | 19,967
Equipment |  | 22,090 | 20,068
Vehicles |  | 457 | 410
Leasehold improvements |  | 23 | 23
Office furniture and equipment |  | 1,413 | 1,418
Construction-in-progress |  | 1,569 | 1,609
Total property and equipment |  | 45,691 | 43,495
Less accumulated depreciation |  | (27,908) | (26,919)
Net property and equipment |  | 17,783 | 16,576
Property and equipment related to discontinued operations |  | 81 | 81
Operating lease right-of-use assets |  | 2,287 | 2,545
Intangibles and other long term assets: |  |  |
Permits |  | 8,922 | 8,790
Other intangible assets - net |  | 875 | 1,065
Finite risk sinking fund (restricted cash) |  | 11,446 | 11,307
Other assets |  | 890 | 989
Other assets related to discontinued operations |  |  | 36
Total assets | [1] | 78,919 | 66,515
Current liabilities: |  |  |
Accounts payable |  | 15,382 | 9,277
Accrued expenses |  | 6,381 | 6,118
Disposal/transportation accrual |  | 1,220 | 1,156
Deferred revenue |  | 4,614 | 5,456
Accrued closure costs - current |  | 75 | 84
Current portion of long-term debt | [2] | 3,595 | 1,300
Current portion of operating lease liabilities |  | 273 | 244
Current portion of finance lease liabilities |  | 525 | 471
Current liabilities related to discontinued operations |  | 898 | 994
Total current liabilities |  | 32,963 | 25,100
Accrued closure costs |  | 6,290 | 5,957
Deferred tax liabilities |  | 471 | 590
Long-term debt, less current portion |  | 3,134 | 2,580
Long-term operating lease liabilities, less current portion |  | 2,070 | 2,342
Long-term finance lease liabilities, less current portion |  | 662 | 466
Other long-term liabilities |  | 626 |
Long-term liabilities related to discontinued operations |  | 252 | 244
Total long-term liabilities |  | 13,505 | 12,179
Total liabilities |  | 46,468 | 37,279
Commitments and Contingencies (Note 14) |  |  |
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; 12,161,539 and 12,123,520 shares issued, respectively; 12,153,897 and 12,115,878 shares outstanding, respectively |  | 12 | 12
Additional paid-in capital |  | 108,931 | 108,457
Accumulated deficit |  | (74,455) | (77,315)
Accumulated other comprehensive loss |  | (207) | (211)
Less Common Stock in treasury, at cost; 7,642 shares |  | (88) | (88)
Total Perma-Fix Environmental Services, Inc. stockholders' equity |  | 34,193 | 30,855
Non-controlling interest |  | (1,742) | (1,619)
Total stockholders' equity |  | 32,451 | 29,236
Total liabilities and stockholders' equity |  | $ 78,919 | $ 66,515
[1] | Segment assets have been adjusted for intercompany accounts to reflect actual assets for each segment.
[2] | Net of debt discount/debt issuance costs of ($0) and ($248,000) at December 31, 2020 and December 31, 2019, respectively. The Promissory Note provided for prepayment of principal over the term of the Note without penalty. In 2019, the Company made total prepayment of principal of $520,000 which was reflected in the current portion of the debt. In 2020, the outstanding principal balance of $1,980,000 was paid-in-full of which of which $416,000 was prepaid.

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