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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 2,234 $ 1,661
Certificates of deposit    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 2,200 2,200
Collateral for letters of credit    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 1,600 1,600
Personal-needs account    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 20 $ 20