Stockholders' Equity	6 Months Ended
Jun. 30, 2020
Equity [Abstract]
Stockholders' Equity	10. Stockholders’ Equity At-the-Market Issuance Sales Agreement On August 23, 2019, the Company entered into an Open Market Sale Agreement^SM (“ATM Agreement”), with Jefferies LLC (“Jefferies”) with respect to an at-the-market offering program under which the Company could offer and sell shares of its common stock (the “ATM Shares”), having an aggregate offering price of up to $15.0 million through Jefferies as its sales agent. The offering and sale of ATM Shares were made pursuant to the Company’s shelf registration statement on Form S-3, which was declared effective by the SEC on February 11, 2019 (the “Registration Statement”). The Company agreed to pay Jefferies a commission equal to 3.0% of the gross sales proceeds of such ATM Shares. During the three months ended March 31, 2020, the Company sold a total of 1,502,892 ATM Shares under the ATM Agreement, in the open market, at a weighted average gross selling price of $7.13 per share for net proceeds of $10.4 million, which completed the program. The Company charged $135,000 in costs related to establish and activate the program against additional paid in capital upon issuance of shares in 2020. Sale of Common Stock In May 2020, the Company completed an underwritten public offering of 5,780,347 shares of its common stock (the “2020 Offering Shares”), pursuant to the Registration Statement. The 2020 Offering Shares were sold at an offering price of $8.65 per share, resulting in net proceeds of $46.6 million, after deducting underwriting discounts, commissions and offering expenses. In addition, the underwriters of the offering were granted the option for a period of 30 days to purchase up to an additional 867,052 shares of common stock at $8.65 per share. In June 2020, the underwriters exercised their option and purchased an additional 440,242 shares of common stock at $8.65 per share, resulting in additional net proceeds to the Company of $3.6 million, after deducting underwriting discounts, commissions and offering expenses.

Stockholders' Equity

6 Months Ended

Jun. 30, 2020

10. Stockholders’ Equity

At-the-Market Issuance Sales Agreement

On August 23, 2019, the Company entered into an Open Market Sale Agreement^SM (“ATM Agreement”), with Jefferies LLC (“Jefferies”) with respect to an at-the-market offering program under which the Company could offer and sell shares of its common stock (the “ATM Shares”), having an aggregate offering price of up to $15.0 million through Jefferies as its sales agent. The offering and sale of ATM Shares were made pursuant to the Company’s shelf registration statement on Form S-3, which was declared effective by the SEC on February 11, 2019 (the “Registration Statement”). The Company agreed to pay Jefferies a commission equal to 3.0% of the gross sales proceeds of such ATM Shares.

During the three months ended March 31, 2020, the Company sold a total of 1,502,892 ATM Shares under the ATM Agreement, in the open market, at a weighted average gross selling price of $7.13 per share for net proceeds of $10.4 million, which completed the program. The Company charged $135,000 in costs related to establish and activate the program against additional paid in capital upon issuance of shares in 2020.

Sale of Common Stock

In May 2020, the Company completed an underwritten public offering of 5,780,347 shares of its common stock (the “2020 Offering Shares”), pursuant to the Registration Statement. The 2020 Offering Shares were sold at an offering price of $8.65 per share, resulting in net proceeds of $46.6 million, after deducting underwriting discounts, commissions and offering expenses. In addition, the underwriters of the offering were granted the option for a period of 30 days to purchase up to an additional 867,052 shares of common stock at $8.65 per share. In June 2020, the underwriters exercised their option and purchased an additional 440,242 shares of common stock at $8.65 per share, resulting in additional net proceeds to the Company of $3.6 million, after deducting underwriting discounts, commissions and offering expenses.