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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Schedule of Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense related to RSUs, stock options, and ESPP shares for the fiscal years ended September 30, 2019, 2018, and 2017, which were allocated as follows (amounts shown in thousands):
| 2019 |  | 2018 |  | 2017
Cost of revenue | $ | 207 |  |  | $ | 78 |  |  | $ | 52 |
Selling and marketing | 2,967 |  |  | 2,656 |  |  | 1,577 |
Research and development | 2,013 |  |  | 1,801 |  |  | 1,028 |
General and administrative | 4,450 |  |  | 4,415 |  |  | 2,821 |
Stock-based compensation expense included in expenses | $ | 9,637 |  |  | $ | 8,950 |  |  | $ | 5,478 |
Schedule of Fair Value Calculations for Stock-Based Compensation Awards | The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2019, 2018, and 2017 were based on the following assumptions:
| 2019 |  | 2018 |  | 2017
Risk-free interest rate | 1.85% – 3.08% |  | 2.04% |  |  | 1.68% – 1.92%
Expected life (years) | 5.43 |  | 5.15 |  | 5.25
Expected volatility | 57% |  |  | 60% |  |  | 74% |
Expected dividends | — |  |  | — |  |  | — |
Schedule of Stock Option Activity | The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2019, 2018, and 2017:
| Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (in Years)
Outstanding at September 30, 2016 | 3,015,374 |  |  | $ | 3.95 |  |  | 6.4
Granted | 147,800 |  |  | $ | 7.06 |  |  |
Exercised | (235,514) |  |  | $ | 2.92 |  |  |
Canceled | (81,794) |  |  | $ | 3.59 |  |  |
Outstanding at September 30, 2017 | 2,845,866 |  |  | $ | 4.21 |  |  | 5.4
Granted | 299,397 |  |  | $ | 8.60 |  |  |
Exercised | (250,823) |  |  | $ | 2.96 |  |  |
Canceled | (88,076) |  |  | $ | 5.23 |  |  |
Outstanding at September 30, 2018 | 2,806,364 |  |  | $ | 4.75 |  |  | 4.6
Granted | 409,368 |  |  | $ | 9.59 |  |  |
Exercised | (1,384,647) |  |  | $ | 3.25 |  |  |
Canceled | (144,183) |  |  | $ | 6.62 |  |  |
Outstanding at September 30, 2019 | 1,686,902 |  |  | $ | 7.00 |  |  | 5.4
Schedule of RSU Activity | The following table summarizes RSU activity in the fiscal years ended September 30, 2019, 2018, and 2017:
| Number of Shares |  | Weighted- Average Fair Value Per Share
Outstanding at September 30, 2016 | 2,046,169 |  |  | $ | 4.90 |
Granted | 1,249,224 |  |  | $ | 6.61 |
Settled | (707,174) |  |  | $ | 4.81 |
Canceled | (231,198) |  |  | $ | 4.93 |
Outstanding at September 30, 2017 | 2,357,021 |  |  | $ | 5.65 |
Granted | 1,184,906 |  |  | $ | 8.54 |
Settled | (745,197) |  |  | $ | 5.26 |
Canceled | (216,554) |  |  | $ | 7.39 |
Outstanding at September 30, 2018 | 2,580,176 |  |  | $ | 6.92 |
Granted | 1,147,976 |  |  | $ | 9.67 |
Settled | (881,420) |  |  | $ | 6.53 |
Canceled | (494,245) |  |  | $ | 7.70 |
Outstanding at September 30, 2019 | 2,352,487 |  |  | $ | 8.26 |

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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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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