Shelf Registration Statement and At-the-Market Offering	3 Months Ended
Mar. 31, 2020
Shelf Registration And At The Market Offering [Abstract]
Shelf Registration Statement and At-the-Market Offering	5. Shelf Registration Statement and At-the-Market Offering On March 14, 2019, the Company filed a shelf registration statement on Form S-3 with the SEC, which was declared effective by the SEC on May 10, 2019 and enables the Company to offer its common stock, preferred stock, debt securities, warrants, subscription rights and units having an aggregate offering price of up to $50,000. As part of this shelf registration, the Company entered into an equity distribution agreement with JMP Securities, pursuant to which the Company may offer and sell shares of its common stock having an aggregate offering price of up to $13,000 through an at-the-market offering program administered by JMP Securities. The Company is not required to sell any securities under this offering program. JMP Securities is entitled to compensation of up to 5.0% of the gross proceeds from sales of the Company’s common stock pursuant to the equity distribution agreement. No shares were sold under this equity distribution agreement for the three months ended March 31, 2020 and 2019. For the year ended December 31, 2019, the Company sold 658 shares of its common stock under this equity distribution agreement and received proceeds of $1,643, net of offering costs of $210, at a weighted average sales price of $2.82 per share. The amount of any future proceeds that may be realized from this equity distribution agreement depends on a variety of factors, including market conditions and the price of the Company’s common stock. As of March 31, 2020, the Company had common stock with an aggregate offering price of up to $11,147 available for issuance under the equity distribution agreement.

Shelf Registration Statement and At-the-Market Offering

3 Months Ended

Mar. 31, 2020

Shelf Registration And At The Market Offering [Abstract]

Shelf Registration Statement and At-the-Market Offering

5. Shelf Registration Statement and At-the-Market Offering

On March 14, 2019, the Company filed a shelf registration statement on Form S-3 with the SEC, which was declared effective by the SEC on May 10, 2019 and enables the Company to offer its common stock, preferred stock, debt securities, warrants, subscription rights and units having an aggregate offering price of up to $50,000. As part of this shelf registration, the Company entered into an equity distribution agreement with JMP Securities, pursuant to which the Company may offer and sell shares of its common stock having an aggregate offering price of up to $13,000 through an at-the-market offering program administered by JMP Securities. The Company is not required to sell any securities under this offering program. JMP Securities is entitled to compensation of up to 5.0% of the gross proceeds from sales of the Company’s common stock pursuant to the equity distribution agreement.

No shares were sold under this equity distribution agreement for the three months ended March 31, 2020 and 2019. For the year ended December 31, 2019, the Company sold 658 shares of its common stock under this equity distribution agreement and received proceeds of $1,643, net of offering costs of $210, at a weighted average sales price of $2.82 per share. The amount of any future proceeds that may be realized from this equity distribution agreement depends on a variety of factors, including market conditions and the price of the Company’s common stock. As of March 31, 2020, the Company had common stock with an aggregate offering price of up to $11,147 available for issuance under the equity distribution agreement.