Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Activity Prior to 2016 (Details)

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Acquisitions - Activity Prior to 2016 (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]          
Gain (loss) recognized due to change in fair value of cash consideration     $ (1,024,000) $ 251,000  
Acquisitions Prior to 2016          
Business Acquisition [Line Items]          
Total deferred cash obligation $ 100,000   100,000   $ 6,600,000
Deferred cash payment amount related to acquisition     6,400,000 2,900,000  
Aggregate contingent cash obligations 200,000   200,000    
Payments of contingent cash obligations     $ 500,000    
Gain (loss) recognized due to change in fair value of cash consideration $ 700,000 $ 200,000   $ 400,000  
Indatus          
Business Acquisition [Line Items]          
Aggregate contingent cash obligations         $ 2,000