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Stockholders' Equity (Tables) | 6 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Stock-Based Compensation Expense Related to Stock Options and RSUs | The following table summarizes stock-based compensation expense related to stock options and RSUs, which was allocated as follows (amounts shown in thousands):
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Cost of revenue | $ | 47 |  |  | $ | 10 |  |  | $ | 87 |  |  | $ | 10 |
Sales and marketing | 360 |  |  | 287 |  |  | 674 |  |  | 530 |
Research and development | 239 |  |  | 162 |  |  | 452 |  |  | 342 |
General and administrative | 577 |  |  | 713 |  |  | 1,095 |  |  | 1,279 |
Stock-based compensation expense included in expenses | $ | 1,223 |  |  | $ | 1,172 |  |  | $ | 2,308 |  |  | $ | 2,161 |
Fair Value Calculations for Stock-Based Compensation Awards | The fair value calculations for stock-based compensation awards to employees for the six months ended March 31, 2017 and 2016 were based on the following assumptions:
| Six Months Ended March 31, 2017 |  | Six Months Ended March 31, 2016
Risk-free interest rate | 1.68% – 1.92% |  | 1.43% – 1.75%
Expected life (years) | 5.32 |  | 5.90
Expected volatility | 78% |  | 83%
Expected dividends | None |  | None
Stock Option Activity | The following table summarizes stock option activity under the Company’s equity plans during the six months ended March 31, 2017:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in Years)
Outstanding, September 30, 2016 | 3,015,374 |  |  | $ | 3.95 |  |  | 6.4
Granted | 107,800 |  |  | $ | 6.13 |  |  |
Exercised | (10,291 | ) |  | $ | 2.85 |  |  |
Canceled | (32,501 | ) |  | $ | 4.29 |  |  |
Outstanding, March 31, 2017 | 3,080,382 |  |  | $ | 4.02 |  |  | 6.0
RSU Activity | The following table summarizes RSU activity under the Company’s equity plans during the six months ended March 31, 2017:
| Number of Shares |  | Weighted-Average Fair Market Value Per Share
Outstanding, September 30, 2016 | 2,046,169 |  |  | $ | 4.90 |
Granted | 917,785 |  |  | $ | 5.77 |
Settled | (532,333 | ) |  | $ | 4.62 |
Canceled | (75,506 | ) |  | $ | 5.15 |
Outstanding, March 31, 2017 | 2,356,115 |  |  | $ | 5.11 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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