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Commitments and Contingencies Addition Information (Details)
$ in Thousands
1 Months Ended
Apr. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
ft²
Subsequent Event [Line Items]      
Total minimum payments due   $ 23,466  
Hopkins, MN      
Subsequent Event [Line Items]      
Term of contract     13 years
Total minimum payments due     $ 14,800
Area of real estate | ft²     59,497
Hopkins, MN | Subsequent Event      
Subsequent Event [Line Items]      
Proceeds from tenant improvement allowance $ (3,300)