Nature of the business (Details)
$ / shares in Units, $ in Thousands |
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3 Months Ended |
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Jul. 30, 2018
USD ($)
$ / shares
shares
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Jul. 24, 2018
USD ($)
$ / shares
shares
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Jul. 09, 2018
shares
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Jul. 10, 2017 |
Jun. 30, 2018
USD ($)
$ / shares
shares
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Jun. 30, 2017
USD ($)
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Mar. 31, 2018
USD ($)
$ / shares
shares
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| Shares issued in exchange of shares in Replimune Group, Inc |
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1
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| Ratio of replacement warrants to capital stock |
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1
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| Net loss | $ |
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$ (10,044)
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$ (3,552)
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| Accumulated deficit | $ |
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$ (38,976)
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$ (28,932)
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| Common stock, authorized |
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27,314,288
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27,314,288
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| Common stock, par value (in dollars per share) | $ / shares |
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$ 0.001
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$ 0.001
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| Subsequent events |
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| Forward stock split ratio for each common stock |
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0.100534
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| Common stock, authorized |
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27,314,288
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| Subsequent events | IPO |
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| Shares issued |
707,936
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6,700,000
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| Shares issued price (in dollars per share) | $ / shares |
$ 15.00
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$ 15.00
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| Proceeds from issuance of initial public offering | $ |
$ 9,876
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$ 93,465
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| Common stock, par value (in dollars per share) | $ / shares |
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$ 0.001
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| Undesignated preferred stock, authorized |
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10,000,000
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| Preferred stock, Par Value (in dollars per share) | $ / shares |
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$ 0.001
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| Subsequent events | IPO | Maximum |
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| Common stock, authorized |
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150,000,000
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