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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 724 $ 601
Accumulated depreciation, Property, plant and equipment 64,579 62,832
Accumulated depreciation, Rental assets 1,783 1,034
Accumulated amortization, Intangible assets $ 20,655 $ 17,380
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 53,853,148 53,165,024
Common stock, shares outstanding 53,853,148 53,165,024