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Revenue Recognition - Changes in contract contract liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Deferred revenue    
Balance at beginning of period   $ 18,364
Additions   30,326
Deductions   (31,554)
Balance at end of period $ 28,836 28,836
Deferred revenue, net of current portion    
Balance at beginning of period   7,833
Deductions   (1,275)
Balance at end of period 6,136 6,136
Change in contract with customers    
Revenue recognized $ 9,600 $ 20,100