Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
4.00% Convertible Secured Subordinated Notes^F1,F2	$5.00	Dec 17, 2015	P	—	A	Dec 17, 2015	Apr 15, 2018	Common Stock	77,431	—	I
4.00% Convertible Secured Subordinated Notes^F3,F4	$5.00	Dec 17, 2015	P	—	A	Dec 17, 2015	Apr 15, 2018	Common Stock	9,427	—	I
4.00% Convertible Secured Subordinated Notes^F5,F6	$5.00	Dec 17, 2015	P	—	A	Dec 17, 2015	Apr 15, 2018	Common Stock	335,084	—	I
4.00% Convertible Secured Subordinated Notes^F7,F8	$5.00	Dec 17, 2015	P	—	A	Dec 17, 2015	Apr 15, 2018	Common Stock	33,545	—	I
4.00% Convertible Secured Subordinated Notes^F9,F10	$5.00	Dec 17, 2015	P	—	A	Dec 17, 2015	Apr 15, 2018	Common Stock	1,221	—	I
4.00% Convertible Secured Subordinated Notes^F11,F12	$5.00	Dec 17, 2015	P	—	A	Dec 17, 2015	Apr 15, 2018	Common Stock	40,489	—	I

Explanation of responses

F1The number of shares issuable on conversion of all Notes is subject to a limit which varies over time depending on the Issuer's then-outstanding shares of Common Stock and any other acquisitions of beneficial ownership by a Reporting Owner during the preceding 12 months. Based on 29,421,308 shares outstanding on November 6, 2015, all of the Notes together when issued were convertible into a maximum of 497,197 shares. The Reporting Owner's Note when issued was convertible into a maximum of 77,431 shares.
F10These securities are directly held by VantagePoint Venture Partners IV Principals Fund, L.P. VantagePoint Venture Associates IV, L.L.C. is the general partner of VantagePoint Venture Partners IV Principals Fund, L.P. VantagePoint Venture Associates IV, L.L.C. disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities. Alan E. Salzman, a managing member of VantagePoint Venture Associates IV, L.L.C., disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.
F11The number of shares issuable on conversion of all Notes is subject to a limit which varies over time depending on the Issuer's then-outstanding shares of Common Stock and any other acquisitions of beneficial ownership by a Reporting Owner during the preceding 12 months. Based on 29,421,308 shares outstanding on November 6, 2015, all of the Notes together when issued were convertible into a maximum of 497,197 shares. The Reporting Owner's Note when issued was convertible into a maximum of 40,489 shares.
F12These securities are directly held by VantagePoint Venture Partners 2006 (Q), L.P. VantagePoint Venture Associates 2006, L.L.C. is the general partner of VantagePoint Venture Partners 2006 (Q), L.P. VantagePoint Venture Associates 2006, L.L.C. disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities. Alan E. Salzman, a managing member of VantagePoint Venture Associates 2006, L.L.C., disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.
F2These securities are directly held by VantagePoint Venture Partners III (Q), L.P. VantagePoint Venture Associates III, L.L.C. is the general partner of VantagePoint Venture Partners III (Q), L.P. VantagePoint Venture Associates III, L.L.C. disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities. Alan E. Salzman, a managing member of VantagePoint Venture Associates III, L.L.C., disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.
F3The number of shares issuable on conversion of all Notes is subject to a limit which varies over time depending on the Issuer's then-outstanding shares of Common Stock and any other acquisitions of beneficial ownership by a Reporting Owner during the preceding 12 months. Based on 29,421,308 shares outstanding on November 6, 2015, all of the Notes together when issued were convertible into a maximum of 497,197 shares. The Reporting Owner's Note when issued was convertible into a maximum of 9,427 shares.
F4These securities are directly held by VantagePoint Venture Partners III, L.P. VantagePoint Venture Associates III, L.L.C. is the general partner of VantagePoint Venture Partners III, L.P. VantagePoint Venture Associates III, L.L.C. disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities. Alan E. Salzman, a managing member of VantagePoint Venture Associates III, L.L.C., disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.
F5The number of shares issuable on conversion of all Notes is subject to a limit which varies over time depending on the Issuer's then-outstanding shares of Common Stock and any other acquisitions of beneficial ownership by a Reporting Owner during the preceding 12 months. Based on 29,421,308 shares outstanding on November 6, 2015, all of the Notes together when issued were convertible into a maximum of 497,197 shares. The Reporting Owner's Note when issued was convertible into a maximum of 335,084 shares.
F6These securities are directly held by VantagePoint Venture Partners IV (Q), L.P. VantagePoint Venture Associates IV, L.L.C. is the general partner of VantagePoint Venture Partners IV (Q), L.P. VantagePoint Venture Associates IV, L.L.C. disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities. Alan E. Salzman, a managing member of VantagePoint Venture Associates IV, L.L.C., disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.
F7The number of shares issuable on conversion of all Notes is subject to a limit which varies over time depending on the Issuer's then-outstanding shares of Common Stock and any other acquisitions of beneficial ownership by a Reporting Owner during the preceding 12 months. Based on 29,421,308 shares outstanding on November 6, 2015, all of the Notes together when issued were convertible into a maximum of 497,197 shares. The Reporting Owner's Note when issued was convertible into a maximum of 33,545 shares.
F8These securities are directly held by VantagePoint Venture Partners IV, L.P. VantagePoint Venture Associates IV, L.L.C. is the general partner of VantagePoint Venture Partners IV, L.P. VantagePoint Venture Associates IV, L.L.C. disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities. Alan E. Salzman, a managing member of VantagePoint Venture Associates IV, L.L.C., disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.
F9The number of shares issuable on conversion of all Notes is subject to a limit which varies over time depending on the Issuer's then-outstanding shares of Common Stock and any other acquisitions of beneficial ownership by a Reporting Owner during the preceding 12 months. Based on 29,421,308 shares outstanding on November 6, 2015, all of the Notes together when issued were convertible into a maximum of 497,197 shares. The Reporting Owner's Note when issued was convertible into a maximum of 1,221 shares.