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Stock-Based Compensation - Plans (Details) - shares
1 Months Ended 6 Months Ended
Jan. 02, 2019
Sep. 30, 2016
Jun. 30, 2019
2014 Plan      
Stock-Based Compensation      
Granted (in shares)     0
2016 Plan      
Stock-Based Compensation      
Automatic increase on share reserve (as a percent)   5.00%  
Additional shares authorized 1,027,876    
Available for future grant (in shares)     376,269