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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 2,008 $ 1,841
Accumulated depreciation, Property, plant and equipment 15,846 18,436
Accumulated depreciation, Rental assets 11,325 10,879
Accumulated amortization, Intangible assets $ 28,140 $ 22,070
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) 79,825,651 73,979,882
Common stock, shares outstanding (in shares) 79,825,651 73,979,882
Series E Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0
Preferred stock, shares authorized (in shares) 10,000 0
Preferred stock issued (in shares) 10,000 0
Preferred stock, shares outstanding (in shares) 10,000 0
Preferred stock, liquidation preference per share (in dollars per share) $ 1,000 $ 0