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Stock-Based Compensation (Tables) | 9 Months Ended
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Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summarized Information about Stock Options | The following table summarizes information about stock options:
|  | Number of Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value |
Balance At September 30, 2018 |  |  | 5,524,399 |  |  | $ | 6.14 |  |  |  |  |  |  |
Granted |  |  | 774,500 |  |  | 14.18 |  |  |  |  |  |  |
Cancelled |  |  | (60,891 | ) |  | 8.11 |  |  |  |  |  |  |
Exercised |  |  | (1,244,161 | ) |  | 5.18 |  |  |  |  |  |  |
Balance At June 30, 2019 |  |  | 4,993,847 |  |  | $ | 7.60 |  |  | 6.0 years |  | $ | 94,374,779 |
Exercisable At June 30, 2019 |  |  | 3,669,243 |  |  | $ | 6.46 |  |  | 4.9 years |  | $ | 73,523,229 |
Assumptions Used to Value Stock Options | The assumptions used to value stock options are as follows:
|  | Nine Months Ended June 30,
|  | 2019 |  |  | 2018
Dividend yield |  | — |  |  | —
Risk-free interest rate |  | 1.9 – 3.1% |  |  | 2.1 – 2.8%
Volatility |  | 115% |  |  | 110%
Expected life (in years) |  | 6.25 |  |  | 6.25
Weighted average grant date fair value per share of options granted |  | $12.21 |  |  | $3.97
Summary of Share Activity Related to RSUs | The following table summarizes the activity of the Company’s RSUs:
|  | Number of RSUs |  |  | Weighted- Average Grant Date Fair Value |
Unvested at September 30, 2018 |  |  | 2,968,500 |  |  | $ | 2.99 |
Granted |  |  | 1,403,888 |  |  |  | 12.43 |
Vested |  |  | (2,197,305 | ) |  |  | 2.78 |
Forfeited |  |  | (123,750 | ) |  |  | 8.98 |
Unvested at June 30, 2019 |  |  | 2,051,333 |  |  | $ | 9.32 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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 + Details
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