Common Stock	9 Months Ended
Sep. 30, 2017
Equity [Abstract]
Common Stock	9. COMMON STOCK *Common Stock Issued, Net of Issuance Costs* Confidentially Marketed Public Offering On January 19, 2017, the Company completed a registered public offering for net proceeds of $8.9 million. The Company sold 1,399,140 shares of common stock at a price of $2.01 per share and 3,426,731 pre-funded warrants at a price of $2.00 per warrant. The warrants have an exercise price of $0.01. All of the pre-funded warrants have been exercised. Registered Direct Offering On February 16, 2017, the Company completed a registered direct offering for net proceeds of $4.5 million with Aspire Capital whereby Aspire Capital purchased 2,100,000 shares of common stock at a price of $1.58 and 748,101 pre-funded common stock purchase warrants at a price of $1.57. The warrants have an exercise price of $0.01 per share and a term of three years. All of the pre-funded warrants have been exercised. Controlled Equity Offering Sales Agreement On April 14, 2017, the Company entered into the ATM Offering with Cantor acting as sales agent. Under the ATM Offering, the Company may from time to time sell shares of its common stock having an aggregate offering amount up to $30.0 million in “at-the-market” offerings, which shares are registered under a registration statement on Form S-3, which was declared effective on March 9, 2017. The Company pays Cantor a commission equal to 2.5% of the gross proceeds from the sale of any shares pursuant to the ATM Offering. As of November 9, 2017, the Company had sold 673,853 shares of common stock for net proceeds of $1.1 million under the ATM Offering. As a result, the Company had approximately $28.9 million remaining available for future sales under the ATM Offering. Common Stock Purchase Agreement with Aspire Capital On September 25, 2017, the Company entered into the CSPA with Aspire Capital to place up to $22.0 million in the aggregate of the Company’s common stock on an ongoing basis when required by the Company over a term of 30 months. The Company will control the timing and amount of sales to Aspire Capital, and at a price based on market prices at that time. As consideration for Aspire Capital entering into the purchase agreement, the Company issued 880,000 shares of its common stock to Aspire Capital. The shares of common stock subject to the CSPA were registered pursuant to the Company’s effective shelf registration statement on Form S-3. On September 27, 2017, pursuant to the CSPA and after satisfaction of certain commencement conditions, Aspire Capital made an initial purchase of 1,428,571 shares of common stock for which the Company received proceeds of $2.0 million. There were no other sales of common stock pursuant to the CSPA and as of November 9, 2017, $20.0 million of the aggregate $22.0 million remained available for future sales under the CSPA. *Common Stock Issued for Investor Relations Fees* On February 28, 2017, the Company issued 150,000 shares with a fair market value of $0.3 million or $2.00 per share as partial consideration for investor relations services that will be provided to the Company over the ensuing 12 months.

Common Stock

9 Months Ended

Sep. 30, 2017

9. COMMON STOCK

Common Stock Issued, Net of Issuance Costs

Confidentially Marketed Public Offering

On January 19, 2017, the Company completed a registered public offering for net proceeds of $8.9 million. The Company sold 1,399,140 shares of common stock at a price of $2.01 per share and 3,426,731 pre-funded warrants at a price of $2.00 per warrant. The warrants have an exercise price of $0.01. All of the pre-funded warrants have been exercised.

Registered Direct Offering

On February 16, 2017, the Company completed a registered direct offering for net proceeds of $4.5 million with Aspire Capital whereby Aspire Capital purchased 2,100,000 shares of common stock at a price of $1.58 and 748,101 pre-funded common stock purchase warrants at a price of $1.57. The warrants have an exercise price of $0.01 per share and a term of three years. All of the pre-funded warrants have been exercised.

Controlled Equity Offering Sales Agreement

On April 14, 2017, the Company entered into the ATM Offering with Cantor acting as sales agent. Under the ATM Offering, the Company may from time to time sell shares of its common stock having an aggregate offering amount up to $30.0 million in “at-the-market” offerings, which shares are registered under a registration statement on Form S-3, which was declared effective on March 9, 2017. The Company pays Cantor a commission equal to 2.5% of the gross proceeds from the sale of any shares pursuant to the ATM Offering. As of November 9, 2017, the Company had sold 673,853 shares of common stock for net proceeds of $1.1 million under the ATM Offering. As a result, the Company had approximately $28.9 million remaining available for future sales under the ATM Offering.

Common Stock Purchase Agreement with Aspire Capital

On September 25, 2017, the Company entered into the CSPA with Aspire Capital to place up to $22.0 million in the aggregate of the Company’s common stock on an ongoing basis when required by the Company over a term of 30 months. The Company will control the timing and amount of sales to Aspire Capital, and at a price based on market prices at that time. As consideration for Aspire Capital entering into the purchase agreement, the Company issued 880,000 shares of its common stock to Aspire Capital. The shares of common stock subject to the CSPA were registered pursuant to the Company’s effective shelf registration statement on Form S-3.

On September 27, 2017, pursuant to the CSPA and after satisfaction of certain commencement conditions, Aspire Capital made an initial purchase of 1,428,571 shares of common stock for which the Company received proceeds of $2.0 million. There were no other sales of common stock pursuant to the CSPA and as of November 9, 2017, $20.0 million of the aggregate $22.0 million remained available for future sales under the CSPA.

Common Stock Issued for Investor Relations Fees

On February 28, 2017, the Company issued 150,000 shares with a fair market value of $0.3 million or $2.00 per share as partial consideration for investor relations services that will be provided to the Company over the ensuing 12 months.