Stockholders' Equity

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Stockholders' Equity

Note 8. Stockholders’ Equity

On January 30, 2014, we filed a shelf registration statement with the SEC on Form S-3. This shelf registration statement allows us to offer and sell from time to time, in one or more series or issuances and on terms that we will determine at the time of the offering any combination and amount of the securities described in the prospectus contained in the registration statement or in the prospectus supplement filed with respect to a particular offering. An aggregate of 530,816 shares of our common stock were registered for issuance pursuant to various prospectus filings on January 30, 2014 in connection with our acquisition of CircuLite. As of March 31, 2015, there remained 248,872 shares of our common stock reserved for potential issuance in connection with future contingent milestone payments under the terms of the merger agreement.

Following satisfaction of a pre-specified milestone in December 2013, we were obligated to pay $5.0 million in cash or stock under the terms of a patent assignment agreement and exclusive license to certain patent applications. We issued an aggregate of 50,330 registered shares of our common stock in January 2014 to settle this liability.

In the three months ended March 31, 2015, we issued an aggregate of 1,429 shares of our common stock upon the exercise of stock options and an aggregate of 88,184 shares of our common stock upon the vesting of restricted stock units.

In the three months ended March 31, 2014, we issued an aggregate of 16,964 shares of our common stock upon the exercise of stock options and an aggregate of 29,999 shares of our common stock upon the vesting of restricted stock units.