Debt (Details) - USD ($) $ / shares in Units, shares in Thousands				1 Months Ended					3 Months Ended		9 Months Ended
	Jan. 11, 2016	Apr. 17, 2014	Aug. 01, 2011	Nov. 30, 2016	Aug. 31, 2016	Jan. 31, 2016	Apr. 30, 2014	Feb. 28, 2013	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Debt
Cash and cash equivalents									$ 60,170,000		$ 60,170,000		$ 119,771,000
Other long-term assets									10,032,000		10,032,000		10,549,000
Carrying amount of the equity conversion component									7,800,000		7,800,000
Principal amount of the Notes									176,500,000		176,500,000
Unamortized debt costs									(3,106,000)		(3,106,000)
Unamortized debt discount									(3,357,000)		(3,357,000)
Net carrying amount									170,037,000		170,037,000
Interest expense related to contractual interest coupon									2,255,000	$ 2,677,000	7,125,000	$ 6,612,000
Interest expense related to amortization of debt discount									661,000	1,285,000	2,117,000	5,155,000
Interest expense related to amortization of debt issuance costs									383,000	508,000	1,165,000	1,279,000
Total interest expense recognized									3,299,000	$ 4,470,000	$ 10,407,000	$ 13,046,000
Secured Loan
Debt
Aggregate principal amount of debt issued	$ 70,000,000
Amendment fee				$ 300,000
Increase in interest rate margin (as a percent)											0.50%
Quarterly installment payment	$ 875,000
Proceeds from debt, net of costs											$ 65,500,000
Offering costs									3,100,000		3,100,000
Initial purchaser's discount and commission											$ 1,400,000
Prepayment premium if loan repaid or accelerated within the first year	2.00%
Prepayment premium if loan repaid or accelerated within the second year	1.00%
Repayment of Secured Loan				$ 5,000,000
Debt issuance costs, amortization period											5 years
Principal amount of the Notes									61,500,000		$ 61,500,000
Unamortized debt costs									(2,322,000)		(2,322,000)
Unamortized debt discount									(1,343,000)		(1,343,000)
Net carrying amount									57,835,000		57,835,000
Secured Loan | Option (ii)
Debt
Interest rate (as a percent)	3.25%
Secured Loan | Maximum | 3.50% Convertible Notes
Debt
Debt instrument maturity before reference instrument maturity date	120 days
Secured Loan | Letter of Credit
Debt
Borrowing capacity									12,500,000		12,500,000
Secured Loan | Letter of Credit | Reclassification
Debt
Cash and cash equivalents									(12,500,000)		(12,500,000)
Other long-term assets									$ 12,500,000		$ 12,500,000
Secured Loan | One month LIBOR | Option (i)
Debt
Margin on interest rate	7.00%								7.50%		7.50%
Secured Loan | One month LIBOR | Option (ii)
Debt
Margin on interest rate	1.00%
Secured Loan | LIBOR | Minimum | Option (i)
Debt
Margin on interest rate	1.00%
Secured Loan | Federal Funds Rate | Option (ii)
Debt
Margin on interest rate	0.50%
Secured Loan | US Prime Rate | Option (ii)
Debt
Margin on interest rate	4.75%								5.25%		5.25%
3.75% Convertible Notes
Debt
Aggregate principal amount of debt issued			$ 100,000,000		$ 36,600,000
Interest rate (as a percent)			3.75%		3.75%	3.75%			3.75%		3.75%
Proceeds from debt, net of costs			$ 96,100,000
Amortization period			5 years
Debt issuance costs, amortization period			5 years
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible into common stock											30 days
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period											5 days
Number of consecutive trading days before five consecutive business days during the note measurement period											5 days
Principal amount used for debt instrument conversion ratio									$ 1,000		$ 1,000
Number of working days preceding maturity date for delivery of shares or payment of cash											33 days
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)											105.5548
Conversion price (in dollars per share)									$ 9.47		$ 9.47
Discount rate on liability component (as a percent)			10.00%
Carrying amount of the equity conversion component			$ 24,100,000
Debt issuance costs and discount allocated to equity conversion component			900,000
Principal amount of the Notes retired						$ 63,400,000
Cash paid to Participating Holders in connection with debt refinancing					$ 37,300,000	$ 66,600,000
Net carrying amount			$ 75,900,000
Total interest expense recognized					$ 700,000
3.75% Convertible Notes | Minimum
Debt
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be convertible into common stock											20 days
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible											130.00%
3.75% Convertible Notes | Maximum
Debt
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate											98.00%
3.50% Convertible Notes
Debt
Aggregate principal amount of debt issued								$ 115,000,000
Interest rate (as a percent)								3.50%	3.50%	3.50%	3.50%	3.50%
Proceeds from debt, net of costs								$ 110,500,000
Debt issuance costs, amortization period								5 years
Principal amount used for debt instrument conversion ratio									$ 1,000		$ 1,000
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)											187.6877
Conversion price (in dollars per share)									$ 5.33		$ 5.33
Repurchase price, as percentage of principal amount, if company undergoes change of control											100.00%
Principal amount of the Notes									$ 44,654,000		$ 44,654,000
Aggregate principal amount of debt refinanced							$ 70,300,000
Conversion rate, amount of debt to be issued per $1000 of principal amount		$ 1,000
Unamortized debt costs									(784,000)		(784,000)
Net carrying amount									43,870,000		43,870,000
Fair value of convertible notes									$ 48,800,000		$ 48,800,000		51,500,000
3.50% Series A Convertible Notes
Debt
Aggregate principal amount of debt issued		$ 70,300,000
Interest rate (as a percent)		3.50%							3.50%	3.50%	3.50%	3.50%
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible into common stock											30 days
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible											130.00%
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period											5 days
Number of consecutive trading days before five consecutive business days during the note measurement period											5 days
Principal amount used for debt instrument conversion ratio									$ 1,000		$ 1,000
Number of working days preceding maturity date for delivery of shares or payment of cash											17 days
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)											187.6877
Conversion price (in dollars per share)									$ 5.33		$ 5.33
Discount rate on liability component (as a percent)											7.00%
Potentially dilutive shares outstanding										500
Principal amount of the Notes									$ 70,346,000		$ 70,346,000
Payments made to convertible note holders		$ 400,000
Repurchase price, as a percentage of the principal amount, in the event of a fundamental change, as defined in Indenture											100.00%
Portion of cash amount paid allocated to debt discount									400,000		$ 400,000
Portion of cash amount paid allocated to equity component									47,000		47,000
Unamortized debt discount									(2,014,000)		(2,014,000)
Net carrying amount									68,332,000		68,332,000
Fair value of convertible notes									$ 76,900,000		$ 76,900,000		$ 81,100,000
3.50% Series A Convertible Notes | Minimum
Debt
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be convertible into common stock											20 days
3.50% Series A Convertible Notes | Maximum
Debt
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate											98.00%
3.50% Convertible Notes and 3.50% Series A Convertible Notes
Debt
Fair value based on closing trading price											$ 100