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Stockholders' Equity - Common Stock and Warrants (Details)				1 Months Ended		2 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 16, 2018 $ / shares shares	Feb. 15, 2018 USD ($) $ / shares shares	Jul. 18, 2017 USD ($) $ / shares shares	Apr. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Feb. 28, 2019 USD ($) shares	Mar. 31, 2018 USD ($) shares	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) vote $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Jun. 07, 2018 shares
Convertible Debt
Authorized number of shares of common stock | shares									500,000,000	250,000,000		500,000,000
Voting right for each share held, number | vote										1
Number of common stock shares issued from underwriting agreement | shares			21,122,449				20,239,839
Price per share of common stock issued (in dollars per share) | $ / shares			$ 12.25
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions			$ 258,800,000						$ 294,583,000	$ 243,037,000
Gross cash proceeds from warrant exercises									$ 3,617,000	$ 0	$ 0
Common stock, par value (in dollars per share) | $ / shares									$ 0.01	$ 0.01
Net proceeds from the issuance of common stock after deducting underwriting discounts and commissions			$ 243,000,000				$ 294,600,000		$ 294,584,000	$ 243,037,000	97,068,000
Subsequent Event
Convertible Debt
Exchange agreement, aggregate principal amount						$ 184,600,000
Exchange agreement, shares authorized | shares						33,000,000
Accrued and unpaid interest on exchange agreement						$ 700,000
Convertible Notes | 2016 Convertible Notes
Convertible Debt
Aggregate principal amount					$ 250,000,000						$ 250,000,000
Fixed interest rate					3.00%						3.00%
Conversion rate					16.33987%
Conversion price (in dollars per share) | $ / shares					$ 6.12						$ 6.12
Warrants
Convertible Debt
Number of common stock shares issued from underwriting agreement | shares				453,214
Gross cash proceeds from warrant exercises				$ 3,600,000
Common Stock
Convertible Debt
Number of common stock shares issued from underwriting agreement | shares	885,000	19,354,839
Price per share of common stock issued (in dollars per share) | $ / shares		$ 15.50
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions		$ 300,000,000
Net proceeds from the issuance of common stock after deducting underwriting discounts and commissions								$ 294,600,000
Common Stock | Warrants
Convertible Debt
Exercise price of warrants (in dollars per share) | $ / shares				$ 7.98
Common Stock | Over-allotment Option
Convertible Debt
Number of common stock shares issued from underwriting agreement | shares	885,000
Price per share of common stock issued (in dollars per share) | $ / shares	$ 15.50
Period granted to underwriters for purchase of shares		30 days
Maximum number of shares granted to underwriters | shares	2,903,225

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