Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1,F2	May 15, 2018	S	25,000	$6.27	D	391,842	I	By: Baker Street Capital L.P.
Common Stock^F1	holding	—	—		—	7,314	D
Common Stock^F1,F3	holding	—	—		—	76,897	I	By: Baskerville SPV, L.P.

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Series A Warrants	$20.63	holding	—	—	—	Feb 9, 2018	Feb 9, 2028	Common Stock	12,461	12,461	D
Series B Warrants	$28.25	holding	—	—	—	Feb 9, 2018	Feb 9, 2028	Common Stock	9,887	9,887	D
Series A Warrants^F2	$20.63	holding	—	—	—	Feb 9, 2018	Feb 9, 2028	Common Stock	710,171	710,171	I
Series B Warrants^F2	$28.25	holding	—	—	—	Feb 9, 2018	Feb 9, 2028	Common Stock	563,506	563,506	I
Series A Warrants^F3	$20.63	holding	—	—	—	Feb 9, 2018	Feb 9, 2028	Common Stock	131,008	131,008	I
Series B Warrants^F3	$28.25	holding	—	—	—	Feb 9, 2018	Feb 9, 2028	Common Stock	103,952	103,952	I

Explanation of responses

F1This Form 4 is filed jointly by Baker Street Capital L.P. ("BSC LP"), Baskerville SPV, L.P. ("Baskerville SPV"), Baker Street Capital GP, LLC ("BSC GP"), Baker Street Capital Management, LLC ("Baker Street Capital Management") and Vadim Perelman (collectively, the "Reporting Persons"). Each Reporting Person may be deemed to be a member of a Section 13(d) group that owns more than 10% of the Issuer's outstanding shares of Common Stock. Each Reporting Person disclaims beneficial ownership of the shares of Common Stock reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such shares of Common Stock for purposes of Section 16 or for any other purpose.
F2Represents securities owned directly by BSC LP. BSC GP, as the general partner of BSC LP, may be deemed to beneficially own the securities owned by BSC LP. Baker Street Capital Management, as the investment manager of BSC LP, may be deemed to beneficially own the securities owned by BSC LP. Mr. Perelman, as the managing member of each of BSC GP and Baker Street Capital Management, may be deemed to beneficially own the securities owned by BSC LP.
F3Represents securities owned directly by Baskerville SPV. BSC GP, as the general partner of Baskerville SPV, may be deemed to beneficially own the securities owned by Baskerville SPV. Baker Street Capital Management, as the investment manager of Baskerville SPV, may be deemed to beneficially own the securities owned by Baskerville SPV. Mr. Perelman, as the managing member of each of BSC GP and Baker Street Capital Management, may be deemed to beneficially own the securities owned by Baskerville SPV.