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v3.21.1

Stockholder's equity (deficit) - Undesignated preferred stock and Restricted common stock (Details) - $ / shares | 1 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2021
Restricted stock |  |  |
Class of Stock |  |  |
Shares issued (in shares) |  | 226,400 |
Stock options vesting period | 2 years | 4 years |
Undesignated Preferred Stock |  |  |
Class of Stock |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.0001
Preferred stock, shares issued |  |  | 0
Preferred stock, shares outstanding |  |  | 0
Undesignated Preferred Stock | Maximum |  |  |
Class of Stock |  |  |
Preferred stock, shares authorized |  |  | 10,000,000

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