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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 2,775 $ 2,683
Accumulated depreciation, Property, plant and equipment 28,958 28,138
Accumulated depreciation, Rental assets 10,375 9,039
Accumulated amortization, Intangible assets $ 28,061 $ 25,473
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 59,221,551 58,644,559
Common stock, shares outstanding 59,221,551 58,644,559