Subsequent Events	9 Months Ended
Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	12. SUBSEQUENT EVENTS On October 10, 2018, the Company closed an underwritten public offering of 26,155,000 shares of its common stock and warrants to purchase up to 19,616,250 shares of common stock, at a combined purchase price of $0.65 per share of common stock and accompanying warrant. The gross proceeds from this offering were $17.0 million, before deducting underwriting discounts and commissions, and offering expenses payable by the Company. The warrants are exercisable immediately upon issuance at a price of $0.70 per share of common stock and have a term of five years commencing on the date of issuance. From October 1, 2018 through November 6, 2018, the Company sold an aggregate of 867,656 shares of its common stock and received $0.5 million after deducting commissions related to the ATM Agreement. On October 1, 2018, the Compensation Committee (the “Committee”) of the Company’s Board of Directors (the “Board”), following consultation with the full Board, approved a repricing of 2,774,140 stock options granted prior to September 1, 2018 (the “Repricing”). The options had exercise prices between $0.75628 and $9.97 per share, which were reduced to $0.568 per share. In connection with the Repricing, on October 1, 2018, the Committee also approved the cancelation of certain options with performance-based vesting conditions (the “Performance Options”) previously issued to Messrs. Gridley, Lieber and Kennedy. Messrs. Gridley, Lieber and Kennedy were previously granted the Performance Options to purchase 60,000, 30,000 and 30,000 shares of the Company’s common stock, respectively, which would vest in full if the Company’s stock price was at or above $19.92 for any consecutive 60-day period within 4 years of the date of grant as long as the recipient provided continuous service during such consecutive 60-day period (the “Performance Criteria”). The Committee determined that the probability of achieving the Performance Criteria was unlikely based on the current trading price of the Company’s common stock on The Nasdaq Capital Market and cancelled the Performance Options pursuant to the Committee’s authority under the 2013 Plan.

12. SUBSEQUENT EVENTS

On October 10, 2018, the Company closed an underwritten public offering of 26,155,000 shares of its common stock and warrants to purchase up to 19,616,250 shares of common stock, at a combined purchase price of $0.65 per share of common stock and accompanying warrant. The gross proceeds from this offering were $17.0 million, before deducting underwriting discounts and commissions, and offering expenses payable by the Company. The warrants are exercisable immediately upon issuance at a price of $0.70 per share of common stock and have a term of five years commencing on the date of issuance.

From October 1, 2018 through November 6, 2018, the Company sold an aggregate of 867,656 shares of its common stock and received $0.5 million after deducting commissions related to the ATM Agreement.

On October 1, 2018, the Compensation Committee (the “Committee”) of the Company’s Board of Directors (the “Board”), following consultation with the full Board, approved a repricing of 2,774,140 stock options granted prior to September 1, 2018 (the “Repricing”). The options had exercise prices between $0.75628 and $9.97 per share, which were reduced to $0.568 per share. In connection with the Repricing, on October 1, 2018, the Committee also approved the cancelation of certain options with performance-based vesting conditions (the “Performance Options”) previously issued to Messrs. Gridley, Lieber and Kennedy. Messrs. Gridley, Lieber and Kennedy were previously granted the Performance Options to purchase 60,000, 30,000 and 30,000 shares of the Company’s common stock, respectively, which would vest in full if the Company’s stock price was at or above $19.92 for any consecutive 60-day period within 4 years of the date of grant as long as the recipient provided continuous service during such consecutive 60-day period (the “Performance Criteria”). The Committee determined that the probability of achieving the Performance Criteria was unlikely based on the current trading price of the Company’s common stock on The Nasdaq Capital Market and cancelled the Performance Options pursuant to the Committee’s authority under the 2013 Plan.