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Stockholders' Equity
 6 Months Ended
Jun. 28, 2015
Equity [Abstract]  
Stockholders' equity
Stockholders' Equity

Common Stock and Preferred Stock

The Company is authorized to issue 100 million shares of common stock and has 10 million shares of authorized but unissued shares of preferred stock. Without any further vote or action by the Company's stockholders, the Board of Directors has the authority to determine the powers, preferences, rights, qualifications, limitations or restrictions granted to or imposed upon any wholly unissued shares of undesignated preferred stock.

Issuance of Common Stock and Warrants

On July 31, 2013, the Company filed a shelf registration statement on Form S-3 under which the Company may, from time to time, sell securities in one or more offerings up to a total dollar amount of $40.0 million. The Company's shelf registration statement was declared effective on August 30, 2013 and expires in August 2016.

In November 2013, the Company issued an aggregate of 8,740,000 shares of common stock, $0.001 par value, in an underwritten public offering at a price of $2.90 per share. The Company received net proceeds from the offering of approximately $23.1 million, net of underwriter's commission and other offering expenses of $2.2 million.

As of June 28, 2015, 2.3 million warrants were outstanding. Approximately1.9 million warrants with a strike price of $2.15 were issued in conjunction with a November 2009 financing. These warrants expired in May 2015. Remaining outstanding warrants approximately 2.3 million warrants with a strike price of $2.98 were issued in conjunction with June 2012 financing. These warrants expire in June 2017 and can be exercised on a cash or cashless basis until August 2016. After this date, the registration statement will no longer be effective and the warrants can only be exercised on a cashless basis.