Exhibit 99.1
Joint Filing Agreement
In accordance with Rule 13d-1(f) under the Securities and Exchange Act of 1934, the persons or entities named below agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Shares of the Issuer and further agree that this joint filing agreement be included as an exhibit to this Schedule 13D. In evidence thereof, the undersigned, being duly authorized, have executed this Joint Filing Agreement as of February 23, 2017.
| ATLAS VENTURE FUND VII, L.P. | |
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| By: Atlas Venture Associates VII, L.P., its general partner | |
| By: Atlas Venture Associates VII, Inc., its general partner | |
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| By: | /s/ Frank Castellucci |
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| Name: Frank Castellucci |
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| Title: Secretary |
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| ATLAS VENTURE ASSOCIATES VII, L.P. | |
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| By: Atlas Venture Associates VII, Inc., its general partner | |
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| By: | /s/ Frank Castellucci |
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| Name: Frank Castellucci |
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| Title: Secretary |
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| ATLAS VENTURE ASSOCIATES VII, INC. | |
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| By: | /s/ Frank Castellucci |
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| Name: Frank Castellucci |
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| Title: Secretary |
