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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Total Stock-Based Compensation Recognized for Stock-Based Awards in Condensed Consolidated Statements of Operations | Total stock-based compensation recognized for stock-based awards in the condensed consolidated statements of operations was as follows (in thousands):
|  | Three Months Ended |
|  | April 30, 2019 |  |  | April 30, 2018 |
Cost of revenue |  | $ | 285 |  |  | $ | 192 |
Sales and marketing |  |  | 446 |  |  |  | 326 |
Research and development |  |  | 1,096 |  |  |  | 863 |
General and administrative |  |  | 1,155 |  |  |  | 933 |
Total stock-based compensation expense |  | $ | 2,982 |  |  | $ | 2,314 |
Summary of Assumptions Used to Estimate Fair Value of Employee Stock Options Grants and Employee Stock Purchase Plan Using Black-Scholes Option Pricing Model | The fair value of employee stock options and ESPP purchases was estimated using the Black–Scholes model with the following assumptions:
|  | Three Months Ended |
|  | April 30, 2019 |  |  | April 30, 2018 |
Stock Options: |  |  |  |  |  |  |  |
Expected volatility |  | 44% |  |  | 43% |
Expected term (in years) |  | 6.1 |  |  | 6.1 |
Risk-free interest rate |  | 2.5% |  |  | 2.7% |
Dividend yield |  | NA |  |  | NA |
|  | Three Months Ended |
|  | April 30, 2019 |  |  | April 30, 2018 |
ESPP: |  |  |  |  |  |  |  |
Expected volatility |  | 40%-49% |  |  | 47%-56% |
Expected term (in years) |  | 0.5-2.0 |  |  | 0.5-2.0 |
Risk-free interest rate |  | 2.4%-2.5% |  |  | 2.0%-2.3% |
Dividend yield |  | NA |  |  | NA |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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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