Quarterly report pursuant to Section 13 or 15(d)

Balance sheets (Parenthetical)

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Balance sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Allowances for accounts receivable $ 6,299 $ 3,745
Allowances for inventories 168 141
Allowances for rental equipment $ 932 $ 832
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 19,346,143 19,059,364
Common stock, shares outstanding 19,346,143 19,059,364