CUSIP NUMBER 75737F108 13G Page 23 of 25 Pages

Exhibit 99.1

Pursuant to Rule 13d-1(k)(1)(iii) of Regulation 13D-G of the General Rules and Regulations of the Securities and Exchange Commission under the Securities and Exchange Act of 1934, as amended, the undersigned agrees that the statement to which this Exhibit is attached is filed on behalf of each of them.

Dated: January 26, 2018

Draper Fisher Jurvetson Fund IX, L.P.
By:	Draper Fisher Jurvetson Fund IX Partners, L.P. (general partner)
By:	DFJ Fund IX, Ltd., its general partner

By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Managing Director

Draper Fisher Jurvetson Fund IX Partners, L.P.
By:	DFJ Fund IX, Ltd., its general partner

By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Managing Director

DFJ Fund IX, Ltd.
By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Managing Director

CUSIP NUMBER 75737F108 13G Page 2 4 of 25 Pages

Draper Fisher Jurvetson Partners IX, LLC
By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Managing Member

Draper Associates, L.P.
By:	Draper Associates, Inc. (General Partner)

By:	/s/Timothy C. Draper
Name:	Timothy C. Draper
Title:	President

Draper Associates, Inc.
By:	/s/ Timothy C. Draper
Name:	Timothy C. Draper
Title:	President

Draper Associates Riskmasters Fund II, LLC
By:	/s/ Timothy C. Draper
Name:	Timothy C. Draper
Title:	Managing Member

Draper Associates Riskmasters Fund III, LLC
By:	/s/ Timothy C. Draper
Name:	Timothy C. Draper
Title:	Managing Member

CUSIP NUMBER 75737F108 13G Page 25 of 25 Pages

/s/ Timothy Draper

Timothy Draper

/s/ John H. N. Fisher

John H. N. Fisher

/s/ Stephen T. Jurvetson

Stephen T. Jurvetson