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Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock options to purchase common stock
Anti-dilutive securities excluded from computations of diluted weighted-average common shares outstanding
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding (in shares)	9,382	8,609	7,117
Unvested restricted stock units
Anti-dilutive securities excluded from computations of diluted weighted-average common shares outstanding
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding (in shares)	228	47	89
Convertible debt securities
Anti-dilutive securities excluded from computations of diluted weighted-average common shares outstanding
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding (in shares)	11,492	0	0

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

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+ References

No definition available.

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