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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 2 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 06, 2020 | Jun. 16, 2020 | May 08, 2020 | Aug. 06, 2020 | Sep. 10, 2020 | Jul. 31, 2020 | Jan. 31, 2020 | Jul. 31, 2019 | Aug. 24, 2020
2018 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) |  |  | 4,333,333 |  |  |  |  |  |
Subsequent Event [Member] | 2018 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Reserved for Future Issuance |  |  |  |  |  |  |  |  | 1,503,068
Common Stock [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) |  |  |  |  |  | 25,144,704 | 7,938,228 | 43,997,807 |
Common Stock [Member] | At Market Issuance Sales Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) | 3,200,000 |  |  | 28,300,000 | 72,300,000 |  |  |  |
Average Sale of Stock Price Per Share | $ 2.51 |  |  | $ 2.55 |  |  |  |  |
Gross Proceeds From Issuance Of Common Stock | $ 8.0 |  |  | $ 72.3 |  |  |  |  |
Payments of Stock Issuance Costs | 0.2 |  |  | 2.2 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 7.8 |  |  | $ 70.1 |  |  |  |  |
Common Stock, Reserved for Future Issuance |  |  |  |  | 2,700,000 |  |  |  |
Maximum [Member] | Common Stock [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate Offering Price |  | $ 75.0 |  |  |  |  |  |  |

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