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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition, Contingent Consideration [Line Items]            
Net rent expense       $ 800 $ 1,200 $ 1,200
Capital leases       20    
Capital leases, accumulated depreciation       4    
Outstanding purchase commitment       $ 2,800    
Scenario, forecast            
Business Acquisition, Contingent Consideration [Line Items]            
Purchase commitment $ 800 $ 1,500 $ 500