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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 1,931 $ 1,660
Accumulated depreciation, Property, plant and equipment 27,567 25,032
Accumulated depreciation, Rental assets 7,685 4,112
Accumulated amortization, Intangible assets $ 22,793 $ 17,996
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 58,259,353 54,372,080
Common stock, shares outstanding 58,259,353 54,372,080