Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,015	$ 1,660
Accumulated depreciation, Property, plant and equipment	25,873	25,032
Accumulated depreciation, Rental assets	5,827	4,112
Accumulated amortization, Intangible assets	$ 19,606	$ 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	55,955,138	54,372,080
Common stock, shares outstanding	55,955,138	54,372,080