Related party transactions	12 Months Ended
Dec. 31, 2019
Related party transactions
Related party transactions	Note 18. Related party transactions In February 2017, the Company closed an underwritten public offering of 5,750,000 shares of its common stock at a public offering price of $5.00 per share, which includes 750,000 shares of the Company’s common stock resulting from the underwriters’ exercise of their over-allotment option at the public offering price on February 17, 2017. On June 30, 2017, the Company closed an underwritten public offering of 4,800,000 shares of its common stock at a public offering price of $6.25 per share for total proceeds of $30.0 million before estimated offering costs of $0.2 million. The Company also granted the underwriter a 30-day option to purchase up to an additional 720,000 shares of its common stock. Deerfield, the Company’s senior lender, participated in the purchase of the Company’s common shares as part of both public offerings, and as a result, is classified as a related party. The Company is obligated under a $60.0 million senior secured credit Facility that was issued by the Company to Deerfield. On June 1, 2017, the Company and Deerfield entered into an Amendment to the Company’s existing Facility with Deerfield which extended the date to repay the Accrued Interest under the Facility to June 1, 2018, which may have been extended to June 1, 2019 at the election of the Company if certain conditions have been met as specified in the Amendment. The right to payment of the Accrued Interest was memorialized in the form of Convertible Notes issued to Deerfield on the Amendment Date. On October 26, 2017, Deerfield provided a conversion notice electing to convert the entire $6.6 million of Convertible Notes into shares of the Company’s common stock at a conversion price of $7.08 per share. The conversion price was based on 95% of the average of the volume weighted average prices per share of the Company’s common stock on the NASDAQ Global Market for the three trading day period immediately preceding such conversion. This resulted in issuing 929,967 shares of the Company’s common stock to Deerfield on this date and the Convertible Notes were cancelled (see Note 11). On November 5, 2018, the Company and Deerfield entered into the Second Amendment to the Facility pursuant to which the Company agreed to pay $7.5 million of principal under the Facility otherwise due in May 2019 upon completion of the November Offering. The Second Amendment provides an option for the $15.0 million principal on the Facility due in May 2020 to be paid in either May 2021 or May 2022 upon the achievement of certain revenue milestones as described in the Second Amendment. Also, pursuant to the Second Amendment, the Company amended and restated its outstanding notes under the Facility in the form of senior secured convertible notes. The Company has the right to pay principal and future interest in shares of Common Stock not to exceed 2,135,625 shares in the aggregate. Additionally, subject to the terms of the amended and restated convertible notes, Deerfield has the right to convert the remaining principal under the Facility into shares of Common Stock not to exceed 3,796,668 shares in the aggregate at a conversion price ranging from 95% to 83% of the greater of the average of the volume weighted average price per share of the Common Stock for the three trading day period immediately preceding such conversion and $10.00. On November 8, 2018, the Company closed an underwritten public offering of 19,999,999 shares of its common stock at a public offering price of $2.30 per share, which includes 2,608,695 shares of its common stock resulting from the underwriters’ exercise of their over-allotment option at the public offering price. The net proceeds to the Company from this offering, after deducting underwriting discounts and commissions and other offering expenses payable by the Company were approximately $43.4 million. Deerfield also participated in the purchase of the Company’s common shares as part of this offering (see Note 11).

Note 18. Related party transactions

In February 2017, the Company closed an underwritten public offering of 5,750,000 shares of its common stock at a public offering price of $5.00 per share, which includes 750,000 shares of the Company’s common stock resulting from the underwriters’ exercise of their over-allotment option at the public offering price on February 17, 2017. On June 30, 2017, the Company closed an underwritten public offering of 4,800,000 shares of its common stock at a public offering price of $6.25 per share for total proceeds of $30.0 million before estimated offering costs of $0.2 million. The Company also granted the underwriter a 30-day option to purchase up to an additional 720,000 shares of its common stock. Deerfield, the Company’s senior lender, participated in the purchase of the Company’s common shares as part of both public offerings, and as a result, is classified as a related party. The Company is obligated under a $60.0 million senior secured credit Facility that was issued by the Company to Deerfield. On June 1, 2017, the Company and Deerfield entered into an Amendment to the Company’s existing Facility with Deerfield which extended the date to repay the Accrued Interest under the Facility to June 1, 2018, which may have been extended to June 1, 2019 at the election of the Company if certain conditions have been met as specified in the Amendment. The right to payment of the Accrued Interest was memorialized in the form of Convertible Notes issued to Deerfield on the Amendment Date. On October 26, 2017, Deerfield provided a conversion notice electing to convert the entire $6.6 million of Convertible Notes into shares of the Company’s common stock at a conversion price of $7.08 per share. The conversion price was based on 95% of the average of the volume weighted average prices per share of the Company’s common stock on the NASDAQ Global Market for the three trading day period immediately preceding such conversion. This resulted in issuing 929,967 shares of the Company’s common stock to Deerfield on this date and the Convertible Notes were cancelled (see Note 11).

On November 5, 2018, the Company and Deerfield entered into the Second Amendment to the Facility pursuant to which the Company agreed to pay $7.5 million of principal under the Facility otherwise due in May 2019 upon completion of the November Offering. The Second Amendment provides an option for the $15.0 million principal on the Facility due in May 2020 to be paid in either May 2021 or May 2022 upon the achievement of certain revenue milestones as described in the Second Amendment. Also, pursuant to the Second Amendment, the Company amended and restated its outstanding notes under the Facility in the form of senior secured convertible notes. The Company has the right to pay principal and future interest in shares of Common Stock not to exceed 2,135,625 shares in the aggregate. Additionally, subject to the terms of the amended and restated convertible notes, Deerfield has the right to convert the remaining principal under the Facility into shares of Common Stock not to exceed 3,796,668 shares in the aggregate at a conversion price ranging from 95% to 83% of the greater of the average of the volume weighted average price per share of the Common Stock for the three trading day period immediately preceding such conversion and $10.00. On November 8, 2018, the Company closed an underwritten public offering of 19,999,999 shares of its common stock at a public offering price of $2.30 per share, which includes 2,608,695 shares of its common stock resulting from the underwriters’ exercise of their over-allotment option at the public offering price. The net proceeds to the Company from this offering, after deducting underwriting discounts and commissions and other offering expenses payable by the Company were approximately $43.4 million. Deerfield also participated in the purchase of the Company’s common shares as part of this offering (see Note 11).