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Stockholders' Equity
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Stockholders' Equity
Stockholders’ Equity

In March 2016, the Company raised $3.5 million in gross proceeds (approximately $3.0 million net of issuance cost) through an underwritten public offering of 10 million shares of common stock at a price per share of $0.35 under the Company’s Registration Statement on Form S-3.

In April 2016, the Company raised an additional $525,000 in gross proceeds through the sale of an additional 1,500,000 shares of common stock at a price per share of $0.35 to the underwriter of the Company’s public offering of common stock closed in March 2016. The sale was completed pursuant to the underwriter's exercise of the over-allotment option granted in connection with the public offering.

At-the-Market Offering Program

Effective June 28, 2016, the Company entered into a sales agreement with respect to an at-the-market offering program ("ATM Agreement") pursuant to which the Company may offer and sell, from time to time at its sole discretion, shares of its common stock, having an aggregate offering price of up to $5.0 million. The Company pays the sales agent a commission of 2.5% of the gross proceeds from the sale of such shares. The Company is not obligated to make any sales of shares under the ATM Agreement, and if it elects to make any sales, the Company can set a minimum sales price for the shares. As of June 30, 2016, no shares had been sold pursuant to the ATM Agreement.