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Description of Business (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of common stock issued from underwriting agreement	20,239,839
Proceeds from issuance of common stock, net of issuance costs	$ 294,600	$ 294,584	$ 0
Retained earnings (accumulated deficit)	$ 383	$ (1,174,978)		$ (1,063,610)

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