Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Jun. 30, 2018	Jun. 30, 2017
AOCI Attributable to Parent [Roll Forward]
Beginning balance	$ 399,686,000	$ 265,849,000	$ (59,464,000)	$ (57,528,000)
Other comprehensive loss before reclassifications	2,000	(412,000)	(50,000)	(187,000)
Amounts reclassified from accumulated other comprehensive income (loss)	0	195,000	0	16,000
Other comprehensive income (loss), net of tax:	2,000	(217,000)	(50,000)	(171,000)
Ending balance	265,849,000	267,230,000	399,686,000	(59,464,000)
Currency Translation Adjustments
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(339,000)	(347,000)	(234,000)	(172,000)
Other comprehensive loss before reclassifications	(8,000)	(21,000)	(105,000)	(62,000)
Amounts reclassified from accumulated other comprehensive income (loss)	0	195,000	0	0
Other comprehensive income (loss), net of tax:	(8,000)	174,000	(105,000)	(62,000)
Ending balance	(347,000)	(173,000)	(339,000)	(234,000)
Net Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(14,000)	(4,000)	(69,000)	40,000
Other comprehensive loss before reclassifications	10,000	(391,000)	55,000	(125,000)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	16,000
Other comprehensive income (loss), net of tax:	10,000	(391,000)	55,000	(109,000)
Ending balance	(4,000)	(395,000)	(14,000)	(69,000)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(353,000)	(351,000)	(303,000)	(132,000)
Other comprehensive income (loss), net of tax:	2,000	(217,000)	(50,000)	(171,000)
Ending balance	$ (351,000)	$ (568,000)	$ (353,000)	$ (303,000)