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Summary of Significant Accounting Policies - Common Shares Outstanding (Details) - shares
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 4,217,971  
Issuance of shares in acquisition (in shares) 11,145  
Vesting of restricted stock unit awards (in shares) 5,354 375
Shares withheld to cover taxes upon vesting of restricted stock unit awards (in shares) (883)  
Ending balance (in shares) 4,233,587 4,217,971