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Common Shares (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jul. 24, 2020
USD ($)
$ / shares
shares
May 18, 2020
USD ($)
$ / shares
shares
Mar. 01, 2019
USD ($)
$ / shares
shares
Feb. 04, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Vote
shares
Jun. 30, 2019
USD ($)
Nature of the Business and Basis of Presentation            
Common stock, cash dividends declared or paid | $         $ 0  
Class A common shares            
Nature of the Business and Basis of Presentation            
Number of votes (per share) | Vote         1  
Class A1 common shares            
Nature of the Business and Basis of Presentation            
Number of votes (per share) | Vote         0  
Convertible ratio to Class A common share         1  
Class B common shares            
Nature of the Business and Basis of Presentation            
Number of votes (per share) | Vote         10  
Convertible ratio to Class A common share         1  
Convertible ratio to Class B1 common share         1  
Class B1 common shares            
Nature of the Business and Basis of Presentation            
Number of votes (per share) | Vote         0  
Convertible ratio to Class A common share         1  
Convertible ratio to Class B common share         1  
Convertible Preferred Shares            
Nature of the Business and Basis of Presentation            
Preferred shares designated | shares         0  
Preferred stock, shares issued (in shares) | shares         0  
Follow-On Public Offering and Private Placement Inclusive of Over-Allotment            
Nature of the Business and Basis of Presentation            
Aggregate proceeds from offerings net of underwriter discounts and commissions, placement agent fees and other offering costs | $ $ 145,925 $ 74,495 $ 82,988      
Follow-On Public Offering and Private Placement | Common Class A and Class A1 common shares            
Nature of the Business and Basis of Presentation            
Gross proceeds from offering | $ $ 155,000 $ 79,570   $ 85,000    
Follow-On Offering | Class A common shares            
Nature of the Business and Basis of Presentation            
Issuance of stock (in shares) | shares 5,952,381 2,760,000   2,654,984    
Share price (in dollars per share) | $ / shares $ 21.00 $ 18.25   $ 18.26    
Gross proceeds from offering | $         $ 47,600 $ 48,595
Private Placement | Class A1 common shares            
Nature of the Business and Basis of Presentation            
Issuance of stock (in shares) | shares 1,428,572 1,600,000   2,000,000    
Share price (in dollars per share) | $ / shares $ 21.00 $ 18.25   $ 18.26    
Over-allotment | Class A common shares            
Nature of the Business and Basis of Presentation            
Issuance of stock (in shares) | shares     161,126      
Share price (in dollars per share) | $ / shares     $ 18.26      
Gross proceeds from offering | $     $ 2,942