Filing Details

Names of Reporting Persons.

Discovery Equity Partners, L.P.

Source of Funds (See Instructions)

WC

Citizenship or Place of Organization

Illinois

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person With

Sole Voting Power

None.

Shared Voting Power

1,053,723

Sole Dispositive Power

None.

Shared Dispositive Power

1,053,723

Aggregate Amount Beneficially Owned by Each Reporting Person

1,053,723

Percent of Class Represented by Amount in Row (11)

4.5%

Type of Reporting Person (See Instructions)

PN

Names of Reporting Persons.

Discovery Group I, LLC

Source of Funds (See Instructions)

AF

Citizenship or Place of Organization

Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person With

Sole Voting Power

None.

Shared Voting Power

1,053,723

Sole Dispositive Power

None.

Shared Dispositive Power

1,053,723

Aggregate Amount Beneficially Owned by Each Reporting Person

1,053,723

Percent of Class Represented by Amount in Row (11)

4.5%

Type of Reporting Person (See Instructions)

IA

Names of Reporting Persons.

Daniel J. Donoghue

Source of Funds (See Instructions)

AF

Citizenship or Place of Organization

United States of America

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person With

Sole Voting Power

None.

Shared Voting Power

1,053,723

Sole Dispositive Power

None.

Shared Dispositive Power

1,053,723

Aggregate Amount Beneficially Owned by Each Reporting Person

1,053,723

Percent of Class Represented by Amount in Row (11)

4.5%

Type of Reporting Person (See Instructions)

IN

Names of Reporting Persons.

Michael R. Murphy

Source of Funds (See Instructions)

AF

Citizenship or Place of Organization

United States of America

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person With

Sole Voting Power

None.

Shared Voting Power

1,053,723

Sole Dispositive Power

None.

Shared Dispositive Power

1,053,723

Aggregate Amount Beneficially Owned by Each Reporting Person

1,053,723

Percent of Class Represented by Amount in Row (11)

4.5%

Type of Reporting Person (See Instructions)

IN

Item 3 of the Schedule 13D is hereby amended to read in its entirety as follows:

The total purchase price for the 1,053,723 shares of Common Stock beneficially owned by the Reporting Persons as of May 19, 2016 was approximately $7,258,833. The source of such funds was the assets of Discovery Equity Partners, including proceeds of margin loans under margin loan facilities maintained in the ordinary course of business by the Discovery Equity Partners with a broker on customary terms and conditions. Discovery Equity Partners is the legal owner of all of the Common Stock beneficially owned by Discovery Group and Messrs. Donoghue and Murphy.

Item 5 of the Schedule 13D is hereby amended to read in its entirety as follows:

The information concerning percentages of ownership set forth below is based on 23,233,297 shares of Common Stock outstanding as of April 29, 2016 in the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016.

Discovery Equity Partners beneficially owns 1,053,723 shares of Common Stock as of May 19, 2016, which represents 4.5% of the outstanding Common Stock.

Discovery Group beneficially owns 1,053,723 shares of Common Stock as of May 19, 2016, which represents 4.5% of the outstanding Common Stock.

Mr. Donoghue beneficially owns 1,053,723 shares of Common Stock as of May 19, 2016, which represents 4.5% of the outstanding Common Stock.

Mr. Murphy beneficially owns 1,053,723 shares of Common Stock as of May 19, 2016, which represents 4.5% of the outstanding Common Stock..

Discovery Group is the sole general partner of Discovery Equity Partners.  Messrs. Donoghue and Murphy are the sole managing members of Discovery Group.  As a consequence, Discovery Group and Messrs. Donoghue and Murphy may be deemed to share beneficial ownership of all of the shares of Common Stock owned by Discovery Equity Partners.

The transactions in Common Stock effected by the Reporting Persons during the past 60 days are set out in Exhibit 1 hereto.

The Reporting Persons ceased to be beneficial owners of more than five percent of the Common Stock on May 12, 2016.

No person other than Discovery Equity Partners is known to any Reporting Person to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, any of the shares of Common Stock reported herein.

Item 6 of the Schedule 13D is hereby amended to read in its entirety as follows:

There are no contracts, arrangements, understandings or relationships (legal or otherwise) between or among any of the Reporting Persons and any other person with respect to any securities of the Company other than the governing documents of Discovery Group and Discovery Equity Partners, the margin loan facilities referred to under Item 3 above, the Joint Filing Agreement of the Reporting Persons with respect to the Schedule 13D that was included as an exhibit thereto, the Joint Filing Agreement of the Reporting Persons with respect to this Amendment No. 1 included as Exhibit 2 to this Amendment No. 1, and the Powers of Attorney granted by Messrs. Donoghue and Murphy with respect to reports under Section 13 of the Securities Exchange Act of 1934, as amended, which Powers of Attorney are included as Exhibit 3 and Exhibit 4, respectively, to this Amendment No. 1.

DISCOVERY GROUP I, LLC,

for itself and as general partner of

DISCOVERY EQUITY PARTNERS, L.P.

By: Michael R. Murphy*

              Mark Buckley

Attorney-in-Fact for Daniel J. Donoghue

Attorney-in-Fact for Michael R. Murphy

Joint Filing Agreement dated as of May 20, 2016, by and among Discovery Equity Partners; Discovery Group; Daniel J. Donoghue; and Michael R. Murphy.