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Equity Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate intrinsic value of options exercised |  | $ 65.7 | $ 0.8 |
Fair value of options vested during period |  | 3.6 | $ 1.0 |
Unrecognized stock-based compensation expense related to unvested stock options |  | $ 77.3 |  |
Weighted Average |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant date fair value (in dollars per share) |  | $ 61.67 | $ 5.23 |
Common stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Annual increase, percent of outstanding shares (percent) |  | 5.00% |  |
Common stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Annual increase (in shares) |  | 15,000,000 |  |
2012 Equity Incentive Plan | Common stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) |  | 15,000,000 |  |
2020 Equity Incentive Plan | Common stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) |  | 10,389,402,000 |  |
ISOs and NSOs | 2012 Equity Incentive Plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price as a percent of estimated fair value (percent) |  |  |  | 100.00%
Award vesting period |  |  |  | 4 years
Required service period |  |  |  | 3 years
ISOs and NSOs | 2012 Equity Incentive Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  |  | 10 years
ISOs | 2012 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stockholder ownership (percent) |  |  |  | 10.00%
ISOs | 2012 Equity Incentive Plan | Minimum | Greater Than 10% Stockholders |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price as a percent of estimated fair value (percent) |  |  |  | 110.00%
Stock options | Weighted Average |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Period of recognition |  | 2 years 4 months 24 days |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 4 years |  |
Period of recognition |  | 3 years 6 months |  |
Unrecognized stock-based compensation expense |  | $ 82.1 |  |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) |  | 2,113,140 |  |
Period of recognition |  | 4 months 24 days |  |
Unrecognized stock-based compensation expense |  | $ 3.1 |  |
Purchase period | 6 months |  |  |
ESPP purchase price of common stock, percent of market price | 85.00% |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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