Exhibit 24.2 Power of Attorney July 28, 2014 Securities and Exchange Commission 100 F Street, NE Washington,DC 20549 This letter confirms that Richard J. Birns, Andrew Kaplan, and Adam J. Brunk are authorized and designated to sign all securities related filings with the Securities and Exchange Commission, including Forms 3, 4 and 5, on my behalf and on behalf of each entity for which I may sign such filings. This authorization and designation shall be valid until either revoked in writing by the undersigned or until three years from the date of this letter. Very truly yours, /s/ Steven R. Becker ---------------------------------------- Steven R. Becker Power of Attorney July 28, 2014 Securities and Exchange Commission 100 F Street, NE Washington, DC 20549 This letter confirms that Richard J. Birns, Andrew Kaplan, and Adam J. Brunk are authorized and designated to sign all securities related filings with the Securities and Exchange Commission, including Forms 3, 4 and 5, on my behalf and on behalf of each entity for which I may sign such filings. This authorization and designation shall be valid until either revoked in writing by the undersigned or until three years from the date of this letter. Very truly yours, /s/ Matthew A. Drapkin ---------------------------------------- Matthew A. Drapkin