Debt (Details) - USD ($) $ / shares in Units, shares in Millions					1 Months Ended				3 Months Ended	12 Months Ended
	Jun. 14, 2017	Jan. 11, 2016	Apr. 17, 2014	Aug. 01, 2011	Jun. 30, 2017	Aug. 31, 2016	Jan. 31, 2016	Feb. 28, 2013	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Aug. 07, 2017
Debt
Cash and cash equivalents					$ 72,084,000					$ 72,084,000	$ 119,771,000
Other long-term assets					15,095,000					15,095,000	10,549,000
Carrying amount of equity conversion component					7,844,000					7,844,000
Principal amount of the Notes					166,548,000					166,548,000
Unamortized debt costs					(555,000)					(555,000)
Unamortized debt discount					(1,422,000)					(1,422,000)
Net carrying amount					164,571,000					164,571,000
Interest expense related to contractual interest coupon										9,465,000	9,411,000	$ 7,774,000
Interest expense related to amortization of debt discount										4,052,000	6,321,000	7,241,000
Interest expense related to amortization of debt issuance costs										3,785,000	1,728,000	1,503,000
Total interest expense recognized										17,302,000	$ 17,460,000	$ 16,518,000
MidCap Revolving Credit Facility
Debt
Initial borrowing capacity	$ 52,000,000
Additional borrowing capacity	33,000,000
Borrowing capacity	85,000,000
Minimum additional tranches	$ 1,000,000
Minimum drawn balance (as a percent)	30.00%
Collateral management fee (as a percent)	0.10%
Unused line fee (as a percent)	0.50%
Refinancing of loans (as a percent)	100.00%
Percentage of commitment amount required to pay within first year	3.00%
Percentage of commitment amount required to pay within second year	2.00%
Percentage of commitment amount required to pay after second year	1.00%
Principal amount of the Notes					51,548,000					51,548,000
Net carrying amount					51,548,000					$ 51,548,000
90-day LIBOR | MidCap Revolving Credit Facility
Debt
Variable rate (as a percent)	4.50%
Margin on interest rate	1.00%
Secured Loan
Debt
Aggregate principal amount of debt issued		$ 70,000,000
Quarterly installment payment		875,000
Proceeds from debt, net of costs		65,500,000
Initial purchaser's discount and commission		$ 1,400,000
Amortization period		5 years
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					60,600,000
Prepayment premium paid					600,000
Interest expense related to amortization of debt discount					1,300,000
Total interest expense recognized					200,000
Payments of Debt Issuance Costs		$ 3,100,000			$ 2,200,000
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 | One month LIBOR | Option (i)
Debt
Margin on interest rate		7.00%
Secured Loan | One month LIBOR | Option (ii)
Debt
Margin on interest rate		1.00%
Secured Loan | LIBOR | Minimum | Option (i)
Debt
Interest rate (as a percent)		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%
3.75% Convertible Note and 3.50% Convertible Note
Debt
Charge associated with repurchase of notes									$ 1,000,000
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%
Proceeds from debt, net of costs				$ 96,100,000
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
Repurchase price, as percentage of principal amount, if company undergoes change of control										100.00%
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 redeemable										20 days
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 redeemable										30 days
Discount rate on liability component (as a percent)				10.00%
Carrying amount of equity conversion component				$ 24,100,000
Debt issuance costs and discount allocated to equity conversion component				900,000
Principal amount of the Notes retired						36,600,000	$ 63,400,000
Cash paid to Participating Holders in connection with debt refinancing						37,300,000	$ 66,600,000
Potentially dilutive shares outstanding							6.7
Principal amount of the Notes				$ 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%
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 redeemable										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					(555,000)					(555,000)
Net carrying amount					$ 44,099,000					$ 44,099,000
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%
Amortization period										7 months
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
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
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
Repurchase price, as percentage of principal amount, if company undergoes change of control										100.00%
Discount rate on liability component (as a percent)										7.00%
Carrying amount of equity conversion component					$ 7,844,000					$ 7,844,000
Principal amount of the Notes					70,346,000					70,346,000
Payments made to convertible note holders			$ 400,000
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					(1,422,000)					(1,422,000)
Net carrying amount					$ 68,924,000					$ 68,924,000
Effective interest rate (as a percent)					7.10%					7.10%
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%
Existing 3.50% Convertible Notes
Debt
Interest rate (as a percent)					3.50%					3.50%			3.50%