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Fair Value Measurements - Summary of Financial Assets that were Accounted for at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Financial assets    
Amortized Cost $ 83,083 $ 96,082
Gross Unrealized Losses   (89)
Cash and cash equivalents 83,083 72,084
Short-term Investments   23,909
Cash    
Financial assets    
Amortized Cost 83,083 70,515
Cash and cash equivalents $ 83,083 70,515
Level 1 | Money market funds    
Financial assets    
Amortized Cost   1,569
Cash and cash equivalents   1,569
Level 2 | U.S. government agency securities    
Financial assets    
Amortized Cost   23,998
Gross Unrealized Losses   (89)
Short-term Investments   $ 23,909