Balance Sheet Accounts (Summary of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Cash	$ 99,506	$ 89,847
Cash equivalents	4,280	4,275
Total cash and cash equivalents	$ 103,786	$ 94,122	$ 85,865	$ 76,225