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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Allowance for doubtful accounts $ 1,669 $ 2,133
Accumulated depreciation, Property, plant and equipment 16,909 16,017
Accumulated depreciation, Rental assets 12,781 12,791
Accumulated amortization, Intangible assets $ 44,886 $ 33,223
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 2,000,000 2,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares issued (in shares) 97,018,396 81,974,051
Common stock, shares outstanding (in shares) 97,018,396 81,974,051
Series E Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 39,500 10,000
Preferred stock issued (in shares) 35,000 10,000
Preferred stock, shares outstanding (in shares) 35,000 10,000
Preferred stock, liquidation preference per share (in dollars per share) $ 1,000 $ 1,000