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Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Anti-dilutive securities
Anti-dilutive securities excluded from computation of earnings per share	5,861	5,717	1,099
Stock options
Anti-dilutive securities
Anti-dilutive securities excluded from computation of earnings per share	5,614	5,516	1,099
RSU
Anti-dilutive securities
Anti-dilutive securities excluded from computation of earnings per share	244	173
ESPP
Anti-dilutive securities
Anti-dilutive securities excluded from computation of earnings per share	3	28

X

- 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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+ References

No definition available.

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