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Fair Value Measurement - Summary of Fair Value Hierarchy of Financial Assets and Liabilities Measured (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Level 1    
Fair value measurement of assets and liabilities    
Assets $ 0 $ 0
Liabilities 0 0
Level 2    
Fair value measurement of assets and liabilities    
Assets 0 0
Liabilities 0 0
Level 3    
Fair value measurement of assets and liabilities    
Assets 0 0
Liabilities $ 0 $ 0