Common Stock	3 Months Ended
Mar. 31, 2020
Common Stock
Common Stock	9. Common Stock On April 5, 2019, the Company entered into an Open Market Sales AgreementSM (the “2019 Sales Agreement”) with Jefferies, LLC (“Jefferies”), under which the Company may offer and sell its common stock having aggregate proceeds of up to $50,000 from time to time through Jefferies, acting as agent. In the three months ended March 31, 2020, the Company sold 2,657,823 shares of common stock under the 2019 Sales Agreement, resulting in net proceeds of approximately $12,690, after commissions and expenses. Through March 31, 2020, the Company sold 9,995,282 shares of common stock under the 2019 Sales Agreement, resulting in net proceeds of approximately $45,316 after underwriting discounts and commissions and expenses. In November 2016, the Company entered into a controlled equity offering sales agreement (the “2016 Sales Agreement”) with Cantor Fitzgerald & Co. (“Cantor”), under which the Company could offer and sell its common stock having aggregate proceeds of up to $40,000 from time to time. In the three months ended March 31, 2019, the Company sold 1,318,481 shares of common stock at-the-market under the 2016 Sales Agreement, resulting in net proceeds of approximately $4,954 after underwriting discounts and commissions and expenses. Through March 31, 2019, the Company sold 6,330,222 shares of common stock under the 2016 Sales Agreement, resulting in net proceeds of approximately $38,381 after underwriting discounts and commissions and expenses. As of February 25, 2019, the Company had no amounts remaining available for future sale under the 2016 Sales Agreement. On February 28, 2019, pursuant to the 2016 Sales Agreement, the Company delivered a termination notice to Cantor, terminating the 2016 Sales Agreement.

9. Common Stock

On April 5, 2019, the Company entered into an Open Market Sales AgreementSM (the “2019 Sales Agreement”) with Jefferies, LLC (“Jefferies”), under which the Company may offer and sell its common stock having aggregate proceeds of up to $50,000 from time to time through Jefferies, acting as agent. In the three months ended March 31, 2020, the Company sold 2,657,823 shares of common stock under the 2019 Sales Agreement, resulting in net proceeds of approximately $12,690, after commissions and expenses. Through March 31, 2020, the Company sold 9,995,282 shares of common stock under the 2019 Sales Agreement, resulting in net proceeds of approximately $45,316 after underwriting discounts and commissions and expenses.

In November 2016, the Company entered into a controlled equity offering sales agreement (the “2016 Sales Agreement”) with Cantor Fitzgerald & Co. (“Cantor”), under which the Company could offer and sell its common stock having aggregate proceeds of up to $40,000 from time to time. In the three months ended March 31, 2019, the Company sold 1,318,481 shares of common stock at-the-market under the 2016 Sales Agreement, resulting in net proceeds of approximately $4,954 after underwriting discounts and commissions and expenses. Through March 31, 2019, the Company sold 6,330,222 shares of common stock under the 2016 Sales Agreement, resulting in net proceeds of approximately $38,381 after underwriting discounts and commissions and expenses. As of February 25, 2019, the Company had no amounts remaining available for future sale under the 2016 Sales Agreement. On February 28, 2019, pursuant to the 2016 Sales Agreement, the Company delivered a termination notice to Cantor, terminating the 2016 Sales Agreement.