Shareholders' Equity and Share-based Compensation - Share-based Compensation (Details) - USD ($)	3 Months Ended				9 Months Ended		113 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 2,876,000		$ 3,112,000		$ 7,732,000	$ 10,659,000
Repurchase of common shares under shares repurchase program					0		6,784,648
Options outstanding, Weighted-Average Remaining Contractual Life (in years)		3 years 21 days			2 years 5 months 23 days
Options vested and expected to vest (in shares)	818,978				818,978		818,978
Options vested and expected to vest (in dollars per share)	$ 10.71				$ 10.71		$ 10.71
Options vested and expected to vest, Weighted Average Remaining Contractual Life (in years)					2 years 5 months 23 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 0				$ 0		$ 0
Exercisable at December 31, 2019 (in shares)	818,978				818,978		818,978
Exercisable at December 31, 2019 (in dollars per share)	$ 10.71				$ 10.71		$ 10.71
Exercisable at December 31, 2019, Weighted Average Remaining Contractual Life (in years)	2 years 5 months 23 days
Exercisable at December 31, 2019, Aggregate Intrinsic Value	$ 0				$ 0		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at June 30, 2019 (in shares)					876,478
Outstanding at December 31, 2019 (In shares)	818,978	876,478			818,978		818,978
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at June 30, 2019 (in dollars per share)					$ 10.98
Outstanding at December 31, 2019 (in dollars per share)	$ 10.71	$ 10.98			$ 10.71		$ 10.71
Options outstanding, Aggregate Intrinsic Value	$ 0	$ 758,871			$ 0		$ 0
Market-based Restricted Stock Units (MSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	100,000		100,000		400,000	500,000
Granted (in shares)				1,300,000
Performance Based Restricted Stock Units (PRSUs) Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 400,000		$ 800,000		$ 1,100,000	$ 2,200,000
Granted (in shares)					155,000