Income Taxes - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 2,521,000	$ 2,521,000	$ 0
Reduction in deferred tax assets	2,521,000	0
Reduction in valuation allowance		2,500,000
Income tax expense (benefit)	0	0	(156,000)	$ (20,000)	$ 5,100,000
Operating loss carryforward resulting from sale	0	0		$ 0	66,200,000
Research and development tax credits					$ 1,500,000
Undistributed earnings of foreign subsidiaries	0	0
Provisional expense			$ 59,500,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	516,600,000	769,100,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 343,000,000.0	$ 593,600,000