Income Taxes (Additional Disclosures) (Details)	6 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 filing_group	Jun. 30, 2018 USD ($)
Income Tax Disclosure [Abstract]
Provisional expense for the effects of the 2017 Tax Act		$ 7,300,000
Provisional expense for remeasurement of net deferred tax assets for the effects of the 2017 Tax Act		5,500,000
Provisional expense for unrepatriated earnings from foreign subsidiaries for the effects of the 2017 Tax Act		200,000
Provisional expense for limitations on the deductibility of executive compensation for the effects of the 2017 Tax Act		1,600,000
Net operating loss carryforwards	$ 127,500,000
Operating loss carryforwards, subject to expiration	106,700,000
Operating loss carryforwards, not subject to expiration	20,800,000
Number of U.S. tax return filing groups | filing_group			1
Valuation allowance	4,042,000	1,187,000		$ 15,500,000
Increase (decrease) in valuation allowance	(11,500,000)
Net deferred tax assets	18,663,000	$ 12,713,000
Unremitted earnings outside the US	3,200,000
Unrecognized tax benefits	$ 0