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Organization (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) segment $ / shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares shares	Nov. 13, 2018 USD ($)	Jan. 16, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of operating segments | segment	1
Proceeds from borrowings on senior secured convertible notes (related party)	$ 0	$ 85,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001		$ 0.001
Convertible senior notes
Restructuring Cost and Reserve [Line Items]
Face value of senior secured convertible notes	$ 204,000,000		$ 204,000,000
Convertible senior notes | Initial Notes | Starboard Value LP
Restructuring Cost and Reserve [Line Items]
Face value of senior secured convertible notes			204,000,000.0
Proceeds from borrowings on senior secured convertible notes (related party)			$ 100,000,000
Converted shares issued (in shares) | shares			4,000,000
Debt instrument, debt covenant, minimum cash balance				$ 20,000,000.0
Convertible senior notes | Right Offering Notes | Starboard Value LP
Restructuring Cost and Reserve [Line Items]
Backstop reduced by the amount of option notes purchased					$ 50,000,000.0
Convertible senior notes | Right Offering Notes | Minimum | Starboard Value LP
Restructuring Cost and Reserve [Line Items]
Right to increase borrowing					35,000,000.0
Increase borrowing limit in cash if conversion is fully subscribed					105,000,000.0
Convertible senior notes | Right Offering Notes | Maximum | Starboard Value LP
Restructuring Cost and Reserve [Line Items]
Additional borrowing option					$ 150,000,000.0
Debt convenant, period one | Convertible senior notes | Initial Notes | Starboard Value LP
Restructuring Cost and Reserve [Line Items]
Debt instrument, debt covenant, minimum cash balance	20,000,000		$ 20,000,000.0
Debt convenant, period two | Convertible senior notes | Initial Notes | Starboard Value LP
Restructuring Cost and Reserve [Line Items]
Debt instrument, debt covenant, minimum cash balance	$ 40,000,000.0		$ 40,000,000.0

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