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Debt - Convertible Debt (Details) $ / shares in Units, $ in Thousands				3 Months Ended			6 Months Ended
	Feb. 16, 2018 shares	Feb. 15, 2018 USD ($) shares	Dec. 21, 2016 USD ($) day $ / shares shares	Jun. 30, 2018 USD ($) shares	Mar. 31, 2018 shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($)	Jun. 07, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Convertible Debt
Number of common stock issued from underwriting agreement | shares					20,239,839
Derivative liability, noncurrent		$ 507,400
Change in fair value of derivatives				$ (7,600)		$ 0	$ (2,739)	$ 0
Common stock, shares authorized | shares				500,000,000			500,000,000		500,000,000	250,000,000
Derivative liabilities									$ 88,300
Common Stock Capped Call Confirmation
Convertible Debt
Derivative asset, noncurrent		$ 13,600
Common Stock
Convertible Debt
Number of common stock issued from underwriting agreement | shares	885,000	19,354,839
Over-allotment Option | Common Stock
Convertible Debt
Number of days granted underwriters for purchase of shares		30 days
Maximum number of additional shares granted to underwriters | shares	2,903,225
Convertible Notes
Convertible Debt
Threshold percentage							130.00%
Convertible Notes | Common Stock Capped Call Confirmation
Convertible Debt
Other assets, current									$ 2,400
Convertible Notes | Convertible Senior Notes 2016, Due 2023
Convertible Debt
Aggregate principle amount			$ 250,000
Net proceeds after deducting fees and estimated expenses			243,000
Proceeds for capped call confirmations			$ 13,500
shares issued per increment of convertible debt | shares			40,849,675
Debt conversion ratio (in shares)			0.1633987
Conversion price (in dollars per share) | $ / shares			$ 6.12
Threshold consecutive trading days | day			30
Debt Instruments [Abstract]
Principal				$ 250,000			$ 250,000			$ 250,000
Less: debt discount				(76,555)			(76,555)			(81,566)
Less: deferred financing				(4,005)			(4,005)			(4,267)
Net carrying value of the debt				169,440			169,440			$ 164,167
Interest expense
Contractual interest expense				1,888			3,775
Amortization of debt discount				2,539			5,011
Amortization of deferred financing				133			262
Total				$ 4,560			$ 9,048
Convertible Notes | Convertible Senior Notes 2016, Due 2023 | Minimum
Convertible Debt
Threshold trading days			20 days
Convertible Notes | Convertible Senior Notes 2016, Due 2023 | Over-allotment Option | Private Placement Purchase Agreement
Convertible Debt
Aggregate principle amount			$ 25,000

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