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Business Combinations - Acquisition Related Costs and Measurement period adjustments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]    
Issuance costs   $ 148
Measurement adjustment to goodwill   1,811
Capella Merger    
Business Acquisition [Line Items]    
Transaction costs $ 19,100 19,100
Issuance costs   $ 100
Measurement period adjustment, current assets (500)  
Measurement period adjustment, noncurrent assets (1,400)  
Measurement adjustment to deferred income tax liabilities 100  
Measurement adjustment to goodwill $ 1,800