8. Equity

During the six months ended June 30, 2017, the Company completed a secondary offering in which the Company sold 741,667 shares of common stock and warrants to purchase 333,750 shares of common stock for $6.12 per unit (each unit consisting of 1/12th share of common stock and 0.04 common stock warrants). The Company received approximately $3.9 million in proceeds, with $3.1 million, net of issuance costs of $0.6 million, allocated to the common stock and $0.8 million allocated to the warrants.  The $0.8 million allocated to warrants were recorded as a derivative liability. In association with the warrants that were recorded as a derivative liability, the Company immediately expensed approximately $0.1 million of issuance costs. The warrants became exercisable on the closing date, expire on the five-year anniversary of the closing date, and have an initial exercise price per share equal to $6.60 per share, subject to adjustments for events of recapitalization, stock dividends, stock splits, stock combinations, reclassifications, reorganizations or similar events affecting the Company’s common stock.

On February 24, 2017, the underwriter in the 2017 secondary offering exercised its option to purchase additional warrants for 30,000 shares of the Company’s common stock.