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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Allowance for doubtful accounts | $ 1,404,000 | $ 1,260,000
Common stock, par value | $ 0.001 | $ 0.001
Common stock, shares authorized (in thousands) | 40,000,000 | 40,000,000
Common stock, shares issued (in thousands) | 31,572,000 | 22,830,000
Common stock, shares outstanding (in thousands) | 31,572,000 | 22,830,000
Series B Convertible Preferred Stock |  |
Series B preferred stock, par value | $ 0.001 | $ 0.001
Series B preferred stock, authorized (in thousands) | 7,235,000 | 7,235,000
Series B preferred stock, shares issued (in thousands) | 1,323,000 | 1,323,000
Series B preferred stock, shares outstanding (in thousands) | 1,323,000 | 1,323,000
Aggregate liquidation preference | $ 3,969,000 | $ 3,969,000
Variable Interest Entity, Primary Beneficiary [Member] |  |
Cash and cash equivalents, VIE | 117,000 | 235,000
Prepaid expenses, VIE | 78,000 | 192,000
Other current assets, VIE | 0 | 741,000
Property, plant and equipment, VIE | 29,481,000 | 22,628,000
Operating lease right-of-use assets, VIE | 19,000 | 28,000
Other assets, VIE | 24,000 | 24,000
Accounts payable, VIE | 7,005,000 | 6,271,000
Current portion of operating lease liability, VIE | 16,000 | 10,000
Other current liabilities, VIE | 506,000 | 129,000
Other long term debt, VIE | 45,000 | 0
Series A preferred units, VIE | 42,210,000 | 32,022,000
Operating lease liability, VIE | 0 | 11,000
Other long term liabilities, VIE | 127,000 | 74,000
Current portion of Series A preferred units, VIE | $ 1,566,000 | $ 2,015,000

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