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Convertible Senior Notes - Additional Information (Detail)				1 Months Ended					3 Months Ended				6 Months Ended		12 Months Ended
	Aug. 09, 2019 USD ($)	Nov. 01, 2018 $ / shares	Jul. 26, 2018 USD ($)	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jun. 30, 2014 USD ($) $ / shares	Jul. 31, 2013 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Aug. 01, 2018 USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs recognized as interest expense									$ 200,000	$ 200,000			$ 400,000	$ 500,000
Long term debt, face amount									143,503,000				143,503,000			$ 140,974,000
Unrealized loss related to a fair market value adjustment									(106,000)	$ (2,410,000)			(2,529,000)	(3,431,000)
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Long term debt, face amount								$ 100,000,000.0
Debt instrument, interest rate								4.25%
Conversion rate								0.1143674
Debt instrument, conversion rate | $ / shares								$ 8.74
Debt instrument repurchase amount											$ 12,000,000	$ 39,100,000			$ 6,100,000
Write-off of debt issuance costs											100,000				$ 100,000
Payment for repurchase of convertible notes												$ 24,100,000
Debt instrument shares common stock issued upon conversion | shares												2,900,000
Gain recognized on retirement of debt											(100,000)
4.25% Convertible Senior Notes (due 2018) | Common Stock
Debt Instrument [Line Items]
Debt instrument repurchase amount											$ 11,600,000
Debt instrument shares common stock issued upon conversion | shares											112,400
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount			$ 8,000,000						$ 30,503,000				$ 30,503,000			27,974,000
Debt instrument, interest rate			3.25%		3.25%				3.25%				3.25%
Debt conversion price, percentage		105.00%
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount							$ 115,000,000		$ 113,000,000				$ 113,000,000			113,000,000
Debt instrument, interest rate							4.875%		4.875%				4.875%
Conversion rate							0.1037613
Debt instrument, conversion rate | $ / shares							$ 9.64
Debt instrument repurchase amount						$ 2,000,000
Write-off of debt issuance costs						100,000
Gain recognized on retirement of debt						$ (100,000)
Convertible senior note payable, fair value									$ 102,500,000				$ 102,500,000			93,200,000
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount					$ 21,500,000				29,500,000.0				29,500,000.0			29,500,000
Debt instrument, interest rate					3.25%
Conversion rate		0.3937008	0.3222688		0.3280302
Debt instrument, conversion rate | $ / shares		$ 2.54
Gain recognized on retirement of debt				$ 500,000	$ (600,000)
Debt instrument, amount redeemed																	$ 13,200,000
Unrealized loss related to a fair market value adjustment									(100,000)					$ (2,400,000)
Convertible senior note payable, fair value									$ 30,500,000				$ 30,500,000			$ 28,000,000
Subsequent Event | 4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Debt refinanced	$ 111,100,000
Debt refinanced, exchanged into similar debt instruments	7,300,000
Secured Debt | Subsequent Event | Refinanced Convertible Senior Notes, Secured Term Debt, Maturing February 2023
Debt Instrument [Line Items]
Long term debt, face amount	103,800,000
Convertible Debt | Subsequent Event | Convertible Senior Notes, Maturing November 2020
Debt Instrument [Line Items]
Long term debt, face amount	$ 29,500,000.0

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