11. Subsequent Event

On October 4, 2019, the Company filed a shelf registration statement on Form S-3 (the "Registration Statement"). Pursuant to the Registration Statement, the Company may offer and sell securities having an aggregate public offering price of up to $250 million. In connection with the filing of the Registration Statement, the Company also entered into a sales agreement with Cowen and Company, LLC, as sales agent, pursuant to which the Company may issue and sell shares of its common stock for an aggregate offering price of up to $75 million under an at-the-market (the “ATM”)  offering program. Pursuant to the ATM, the Company will pay Cowen and Company, LLC a commission rate of up to 3.0% of the gross proceeds from the sale of any shares of common stock.