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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Stock-Based Compensation Expense Related to Stock Options and RSUs | The following table summarizes stock-based compensation expense related to RSUs, stock options, and ESPP shares for the fiscal years ended September 30, 2018, 2017, and 2016, which were allocated as follows (amounts shown in thousands):
| 2018 |  | 2017 |  | 2016
Cost of revenue | $ | 78 |  | $ | 52 |  | $ | 39
Selling and marketing | 2,656 |  | 1,577 |  | 1,099
Research and development | 1,801 |  | 1,028 |  | 660
General and administrative | 4,415 |  | 2,821 |  | 2,281
Stock-based compensation expense included in expenses | $ | 8,950 |  | $ | 5,478 |  | $ | 4,079
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, 2018, 2017, and 2016 were based on the following assumptions:
| 2018 |  | 2017 |  | 2016
Risk-free interest rate | 2.04% |  | 1.68% – 1.92% |  | 1.43% – 1.66%
Expected life (years) | 5.15 |  | 5.25 |  | 5.90
Expected volatility | 60% |  |  | 74% |  |  | 83% |
Expected dividends | — |  | — |  | —
Stock Option Activity | The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2018, 2017, and 2016:
| Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (in Years)
Outstanding at September 30, 2015 | 3,647,705 |  | $ | 3.70 |  | 7.2
Granted | 98,500 |  | $ | 4.51 |  |
Exercised | (661,663) |  | $ | 2.67 |  |
Canceled | (69,168) |  | $ | 4.51 |  |
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
RSU Activity | Restricted Stock Units The following table summarizes RSU activity in the fiscal years ended September 30, 2018, 2017, and 2016:
| Number of Shares |  | Weighted- Average Fair Value Per Share
Outstanding at September 30, 2015 | 802,917 |  | $ | 4.49
Granted | 1,536,000 |  | $ | 4.82
Settled | (261,621) |  | $ | 4.77
Canceled | (31,127) |  | $ | 4.19
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

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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 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 + Details
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