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Stock-based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 08, 2016
Aug. 31, 2017
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for outstanding awards (in shares)     7,512,769   8,301,138  
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to non-vested stock-based awards     $ 6.6      
Unrecognized compensation cost related to non-vested stock based awards, period for recognition     2 years 6 months 14 days      
RSU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to non-vested stock-based awards     $ 28.3      
Unrecognized compensation cost related to non-vested stock based awards, period for recognition     2 years 7 months 27 days      
PRSU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option expected life   1 year        
Number of awards   2        
Unrecognized compensation cost related to non-vested stock-based awards     $ 0.4      
Unrecognized compensation cost related to non-vested stock based awards, period for recognition     1 year 9 months      
Performance-Based Restricted Stock Units (PRSUs) Two-Year            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ownership percentage threshold for employee owned incentive stock options to qualify for exercise price per share   100.00%        
Stock option expected life   2 years        
Performance-Based Restricted Stock Units (PRSUs) Two-Year | Year one            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option and restricted stock units vesting rights, percentage   50.00%        
Performance-Based Restricted Stock Units (PRSUs) Two-Year | Quarterly            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option and restricted stock units vesting rights, percentage   5.00%        
Performance-Based Restricted Stock Units (PRSUs), One-Year            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ownership percentage threshold for employee owned incentive stock options to qualify for exercise price per share   200.00%     200.00%  
Performance-Based Restricted Stock Units (PRSUs), One-Year | Year one            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option and restricted stock units vesting rights, percentage   50.00%     50.00%  
Performance-Based Restricted Stock Units (PRSUs), One-Year | Quarterly            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option and restricted stock units vesting rights, percentage   5.00%        
Equity Incentive Plan, 2016            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (in shares)           4,700,000
Increase in units for meeting metrics, percentage 10.00%          
Authorized shares available for future issuance (in shares)     1,193,710      
Equity Incentive Plan, 2016 | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option expected life 10 years          
Equity Incentive Plan, 2016 | Employee stock options and restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 4 years          
Equity Incentive Plan, 2016 | Employee stock options and restricted stock units | Year one            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option and restricted stock units vesting rights, percentage 25.00%   25.00%      
Equity Incentive Plan, 2016 | Employee stock options and restricted stock units | Quarterly            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option and restricted stock units vesting rights, percentage     6.25%      
Equity Incentive Plan, 2006            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (in shares) 2,800,000          
Shares reserved for outstanding awards (in shares) 8,696,444          
Equity Incentive Plan, 2016, more than 10% ownership            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of fair market value 110.00%          
Equity Incentive Plan, 2016, less than 10% ownership            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of fair market value 100.00%          
Subsequent event | Performance-Based Restricted Stock Units (PRSUs), One-Year | Year one            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option and restricted stock units vesting rights, percentage       20.00%