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Stockholders' Equity
 3 Months Ended
Sep. 30, 2015
Stockholders' Equity

5. Stockholders’ Equity

Equity Transactions

Shelf Registration Statement

In April 2014, the Company filed a shelf registration statement on Form S-3 with the SEC (“shelf registration statement”). The shelf registration statement was declared effective by the SEC in April 2014. The shelf registration statement permits the Company to sell, from time to time, up to $150 million of common stock, preferred stock and warrants. Pursuant to SEC regulations, if the market value of the Company’s public float is below $75 million, the Company cannot sell securities from the shelf registration statement which represent more than one-third of the market value of the Company’s non-affiliated public float during any 12-month period. As of September 30, 2015, there is $104 million aggregate value of securities available under the shelf registration statement.

Underwritten Registered Offering

In December 2014, the Company completed an underwritten registered offering of 11,500,000 shares of its common stock at a price per share of $4.00, pursuant to the shelf registration statement. The Company received net cash proceeds of $43.1 million associated with the offering, after costs of $2.9 million.

Warrants

As of September 30, 2015, there were outstanding warrants to purchase 315,484 shares of the Company’s common stock at an exercise price of $7.14 per share, which expire in May 2017, issued in conjunction with the Company’s May 2012 rights offering; outstanding Series A warrants and warrants issued to the Company’s placement agent for its May 2011 private placement to purchase up to 215,721 shares of common stock at an exercise price of $6.00 per share, which expire in November 2016; and warrants to purchase 3,230,202 shares of the Company’s common stock at an exercise price of $3.12 per share, which expire in December 2017, issued in conjunction with its December 2012 private placement.