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Stock-Based Plans - Narrative (Details) |  | 1 Months Ended | 9 Months Ended |
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May 31, 2019 | Jun. 30, 2020 shares | May 31, 2020 offering_period shares | Jun. 30, 2019 USD ($) shares | Sep. 30, 2020 USD ($) | Jan. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of voting power which impacts the term of equity incentive plan |  |  |  |  | 10.00% |
ESPP, offering period | 6 months | 6 months |  | 12 months |  |
Purchase price of common stock, percent | 85.00% | 85.00% |  |  |  |
ESPP, number of six-month offering periods | offering_period |  |  | 2 |  |  |
2011 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards authorized for issuance (shares) | shares |  | 1,400,000 |  | 5,000,000.0 |  |
2017 Inducement Award Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards authorized for issuance (shares) | shares |  |  |  |  |  | 2,000,000
Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost related to stock-based compensation arrangements |  |  |  |  | $ 1,100,000 |
Weighted average remaining contractual terms |  |  |  |  | 1 year 4 months 24 days |
2017 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Incremental compensation cost |  |  |  |  | $ 300,000 |
Additional awards authorized for issuance (shares) | shares |  | 3,000,000.0 |  |  |  |
Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |
Award vesting percentage |  |  | 50.00% |  |  |
Number of months over which options vest ratably |  |  |  |  | 36 months |
Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  |  | 1 year |
Award vesting percentage |  |  | 25.00% |  |  |
Number of months over which options vest ratably |  |  |  |  | 48 months |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  |  | 4 years |
Rate at which outstanding options vest on the first anniversary of the option grant date |  |  |  |  | 25.00% |
Awards authorized for issuance (shares) | shares |  |  | 1,800,000 |  |  |
Total unrecognized compensation cost related to stock-based compensation arrangements |  |  |  |  | $ 22,000,000.0 |
Weighted average remaining contractual terms |  |  |  |  | 2 years 9 months 18 days |
Restricted Stock Units (RSUs) | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Rate at which outstanding options vest on the first anniversary of the option grant date |  |  |  |  | 25.00% |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |
Stock option grants exercise price minimum percentage on fair market value |  |  |  |  | 100.00% |
Stock options held by owners of more than 10% of common stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period |  |  |  |  | 5 years |
Stock option grants exercise price minimum percentage on fair market value |  |  |  |  | 110.00% |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |
Total unrecognized compensation cost related to stock-based compensation arrangements |  |  |  |  | $ 4,600,000 |
Weighted average remaining contractual terms |  |  |  |  | 1 year 8 months 12 days |
Performance Shares | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of performance period |  |  |  |  | 0.00% |
Performance Shares | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of performance period |  |  |  |  | 200.00% |
Employee Stock | 2017 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum employee subscription rate | 10.00% | 10.00% |  | 15.00% |  |
Maximum employee purchase amount |  |  |  | $ 25,000 |  |

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