Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1,F4,F8	Jan 24, 2019	S	60,107	$11.61	D	1,272,711	I	Mobius Technology Ventures VI, L.P.
Class A Common Stock^F1,F5,F8	Jan 24, 2019	S	64,467	$11.61	D	1,369,511	I	SOFTBANK U.S. Ventures VI L.P.
Class A Common Stock^F1,F6,F8	Jan 24, 2019	S	2,458	$11.61	D	52,218	I	Mobius Technology Ventures Side Fund VI L.P
Class A Common Stock^F1,F7,F8	Jan 24, 2019	S	2,341	$11.61	D	49,745	I	Mobius Technology Ventures Advisors Fund VI L.P.
Class A Common Stock^F2,F4,F8	Jan 25, 2019	S	51,772	$11.60	D	1,220,939	I	Mobius Technology Ventures VI, L.P.
Class A Common Stock^F2,F5,F8	Jan 25, 2019	S	55,528	$11.60	D	1,313,983	I	SOFTBANK U.S. Ventures VI L.P.
Class A Common Stock^F2,F6,F8	Jan 25, 2019	S	2,117	$11.60	D	50,101	I	Mobius Technology Ventures Side Fund VI L.P.
Class A Common Stock^F2,F7,F8	Jan 25, 2019	S	2,016	$11.60	D	47,729	I	Mobius Technology Ventures Advisors Fund VI L.P.
Class A Common Stock^F3,F4,F8	Jan 28, 2019	S	15,225	$11.07	D	1,205,714	I	Mobius Technology Ventures VI, L.P.
Class A Common Stock^F3,F5,F8	Jan 28, 2019	S	16,329	$11.07	D	1,297,654	I	SOFTBANK U.S. Ventures VI L.P.
Class A Common Stock^F3,F6,F8	Jan 28, 2019	S	623	$11.07	D	49,478	I	Mobius Technology Ventures Side Fund VI L.P.
Class A Common Stock^F3,F7,F8	Jan 28, 2019	S	593	$11.07	D	47,136	I	Mobius Technology Ventures Advisors Fund VI L.P.

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $11.40 - $12.05 per share. Each Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
F2Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $11.28 - $11.89 per share. Each Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
F3Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $11.00 - $11.45 per share. Each Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
F4The securities are held by Mobius Technology Ventures VI, L.P. ("Mobius Technology VI").
F5The securities are held by SOFTBANK U.S. Ventures VI, L.P. ("Softbank").
F6The securities are held by Mobius Technology Ventures Side Fund VI, L.P. ("Mobius Side Fund").
F7The securities are held by Mobius Technology Ventures Advisors Fund VI, L.P. ("Mobius Advisors Fund").
F8Mobius VI LLC ("Mobius VI") is the General Partner of Mobius Technology VI, Softbank, Mobius Side Fund and Mobius Advisors Fund (collectively, the "Mobius Funds"). Mobius VI may be deemed to indirectly beneficially own the securities owned by the Mobius Funds. Bradley A. Feld and Jason A. Mendelson are Managing Directors of Mobius VI and each share voting and dispositive power over the securities held by Mobius Funds. Each reporting person disclaims beneficial ownership of these securities except to the extent of his or its respective pecuniary interest therein.