Convertible Senior Notes (Details) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2015 USD ($) $ / shares shares	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs				$ 547,366	$ 547,366
4.75% Convertible Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 100,000,000
Net proceeds from debt	96,300,000
Payment of debt issuance costs	$ 3,700,000
Frequency of interest payments				semiannually
Debt instrument, stated percentage	4.75%	4.75%		4.75%
Debt instrument, effective interest rate		5.48%		5.48%
Number of shares issuable under conversion of debt | shares	19.6
Debt conversion ratio				0.1958336
Principal amount of Convertible Senior Notes	$ 1,000
Conversion price of debt | $ / shares	$ 5.11
Percentage of principal amount redeemable	100.00%
Interest expense				$ 1,400,000	4,100,000
Amortization of debt issuance costs		$ 200,000	$ 200,000	$ 500,000	$ 500,000