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Summary of Significant Accounting Policies - Recent Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle
Total stockholders' equity	$ 342,912	$ 352,850	$ 360,151		$ 347,834
Selling, general and administrative	127,200	88,671	71,151
Net cash used in operating activities	$ (299,955)	(213,695)	$ (150,147)
ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle
Net cash used in operating activities		1,800
ASU 2016-02 | Forecast | Minimum
New Accounting Pronouncements or Change in Accounting Principle
Right-of-use asset				$ 15,000
Operating lease liability				15,000
ASU 2016-02 | Forecast | Maximum
New Accounting Pronouncements or Change in Accounting Principle
Right-of-use asset				18,000
Operating lease liability				$ 18,000
Accumulated Foreign Currency Adjustment Attributable to Parent | ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle
Total stockholders' equity		$ (383)

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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