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Convertible Senior Notes - Additional Information (Detail)			1 Months Ended					3 Months Ended				12 Months Ended
	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	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	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
Long term debt, face amount								143,397,000					$ 140,974,000
Unrealized loss related to a fair market value adjustment								(2,423,000)	(1,021,000)
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 in share per $1000 principal amount of notes							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						$ 30,397,000					27,974,000
Debt instrument, interest rate		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
Debt instrument, interest rate						4.875%		4.875%
Conversion rate in share per $1000 principal amount of notes						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								$ 102,800,000					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
Debt instrument, interest rate				3.25%
Conversion rate in share per $1000 principal amount of notes	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								(2,400,000)	$ (1,000,000)
Convertible senior note payable, fair value								$ 30,400,000					$ 28,000,000

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