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Net Income (Loss) Per Share Attributable to Common Stockholders - Anti-Dilutive Shares (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Anti-dilutive shares excluded from calculation of diluted earnings (loss) per share:
Total shares excluded from earnings (loss) per share - diluted	1,246	6,069	20,115
Equity Awards
Anti-dilutive shares excluded from calculation of diluted earnings (loss) per share:
Total shares excluded from earnings (loss) per share - diluted	1,246	6,069	248
Convertible Preferred Stock
Anti-dilutive shares excluded from calculation of diluted earnings (loss) per share:
Total shares excluded from earnings (loss) per share - diluted			19,320
Convertible Preferred Stock Warrants
Anti-dilutive shares excluded from calculation of diluted earnings (loss) per share:
Total shares excluded from earnings (loss) per share - diluted			547

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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://www.xbrl.org/2003/role/presentationRef
-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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