CUSIP NUMBER 879181105 13G Page 33 of 36 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 Growth Fund 2006, L.P.
By:	Draper Fisher Jurvetson Growth Fund 2006 Partners, L.P. (general partner)
By:	DFJ Growth Fund 2006, Ltd., its general partner
By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Director
Draper Fisher Jurvetson Growth Fund 2006 Partners, L.P.
By:	DFJ Growth Fund 2006, Ltd., its general partner
By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Director
DFJ Growth Fund 2006, Ltd.
By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Director

CUSIP NUMBER 879181105 13G Page 34 of 36 Pages

Draper Fisher Jurvetson Partners Growth Fund 2006, LLC
By:	/s/ John H. N. Fisher
Name:	John H. N. Fisher
Title:	Authorized Member
DFJ Growth Management, LLC
By:	/s/ Randy Glein
Name:	Randy Glein
Title:	Managing Member
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

CUSIP NUMBER 879181105 13G Page 35 of 36 Pages

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

CUSIP NUMBER 879181105 13G Page 36 of 36 Pages

/s/ Timothy Draper

Timothy Draper

/s/ John H. N. Fisher

John H. N. Fisher

/s/ Stephen T. Jurvetson

Stephen T. Jurvetson

/s/ Barry M. Schuler

Barry M. Schuler

/s/ Mark W. Bailey

Mark W. Bailey

/s/ Randy Glein

Randy Glein