Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Activity Prior to 2014 (Details)

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Acquisitions - Activity Prior to 2014 (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]          
Gain (loss) recognized due to change in fair value of cash consideration   $ 300,000 $ (3,018,000) $ 564,000  
Acquisitions Prior to 2014          
Business Acquisition [Line Items]          
Total deferred cash obligation $ 2,400,000   2,400,000   $ 2,400,000
Deferred cash obligation discount 100,000   100,000   100,000
Deferred cash payment amount related to acquisition 600,000   1,700,000    
Aggregate contingent cash obligations         $ 1,800,000
Gain (loss) recognized due to change in fair value of cash consideration 500,000 1,100,000 300,000 500,000  
Payments of contingent cash obligations $ 0 $ 200,000 $ 800,000 $ 200,000  
Acquisitions Prior to 2014 | Common Stock          
Business Acquisition [Line Items]          
Shares issued in business acquisition 36,250