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Stock based awards - Stock-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jul. 31, 2019 | Jun. 30, 2019 | Apr. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Stock-based compensation |  |  |  |  |
Total stock-based compensation expense |  |  |  | $ 2,364 | $ 1,237
Total unrecognized compensation cost related to unvested stock-based awards |  |  |  | $ 23,608 |
Weighted average period of recognition for unrecognized compensation cost |  |  |  | 2 years 3 months 18 days |
Common Stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Issuance of restricted common stock upon early exercise of stock options (in shares) | 491,207 | 491,207 | 491,207 |  |
Exercise price of common stock purchase | $ 0.65 | $ 0.65 | $ 0.65 |  |
Proceeds from the early exercise of stock options in exchange for restricted common stock | $ 321 | $ 321 | $ 321 |  |
Research and development expense |  |  |  |  |
Stock-based compensation |  |  |  |  |
Total stock-based compensation expense |  |  |  | $ 1,645 | 368
General and administrative expense |  |  |  |  |
Stock-based compensation |  |  |  |  |
Total stock-based compensation expense |  |  |  | $ 719 | $ 869

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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 Amount of cost to be recognized for option under share-based payment arrangement. + 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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