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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Allowance on accounts receivable | $ 408 | $ 1,384
Property, plant and equipment, accumulated depreciation | 26,692 | 21,715
Rental assets - accumulated depreciation | 5,392 | 15,754
Intangible assets - accumulated amortization | $ 48,404 | $ 63,020
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized | 2,000,000 | 2,000,000
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized | 150,000,000 | 150,000,000
Common stock, shares issued | 105,380,533 | 99,399,029
Common stock, shares outstanding | 105,380,533 | 99,399,029
Series E preferred shares |  |
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized | 39,500 | 39,500
Preferred stock, shares issued | 25,000 | 35,000
Preferred stock, shares outstanding | 25,000 | 35,000
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 | $ 1,000

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