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Employee Stock Purchase Plan (Tables)

3 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Weighted Average Assumptions of Employee Stock Purchase Plan

The following are the weighted average assumptions used for each respective period:

	Three Months Ended
	December 31,
	2017			2018
Dividend yield	0.0%			0.0%
Risk-free interest rate	1.2%			2.4%
Volatility	50.9%			52.2%
Expected life	Six months			Six months

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- References

No definition available.

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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