Stockholders’ Equity	12 Months Ended
Dec. 31, 2019
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity Preferred Stock The Company issued Series 1 redeemable convertible preferred stock, Series 2 redeemable preferred stock, Series AA redeemable convertible preferred stock, Series B redeemable convertible preferred stock, Series C-1, Series C-2 redeemable convertible preferred stock, Series C-3 redeemable convertible preferred stock, and Series D convertible preferred stock (collectively, “Preferred Stock”). Upon the closing of the IPO in October 2018, all shares of Preferred Stock were automatically converted into an aggregate of 13,225,048 shares of common stock. Initial Public Offering In October 2018, the Company completed an IPO of its common stock, which resulted in the issuance and sale of an aggregate of 9,864,666 shares of common stock at a public offering price of $5.00 per share, generating net proceeds of $43.0 million after deducting underwriting discounts and commissions and other offering costs. April 2019 Offering In April 2019, the Company completed an underwritten public offering of its common stock, which resulted in the issuance and sale of an aggregate of 4,124,475 shares of common stock at a public offering price of $12.00 per share, generating net proceeds of $46.3 million after deducting underwriting discounts and commissions and other offering costs. Shelf Registration Statement In December 2019, the Company filed the 2019 Shelf Registration Statement on Form S-3, which became effective in January 2020. The 2019 Shelf Registration Statement permits: (i) the offering, issuance and sale by the Company of up to a maximum aggregate offering price of $200.0 million of common stock, preferred stock, debt securities and warrants in one or more offerings and in any combination; and (ii) the offering, issuance and sale by the Company of up to a maximum aggregate offering price of $60.0 million of the Company's common stock that may be issued and sold in “at-the-market” sales pursuant to the Equity Distribution Agreement. No securities have been sold under the 2019 Shelf Registration Statement and no shares have been sold pursuant to the Equity Distribution Agreement.

Stockholders’ Equity

Preferred Stock

The Company issued Series 1 redeemable convertible preferred stock, Series 2 redeemable preferred stock, Series AA redeemable convertible preferred stock, Series B redeemable convertible preferred stock, Series C-1, Series C-2 redeemable convertible preferred stock, Series C-3 redeemable convertible preferred stock, and Series D convertible preferred stock (collectively, “Preferred Stock”). Upon the closing of the IPO in October 2018, all shares of Preferred Stock were automatically converted into an aggregate of 13,225,048 shares of common stock.

Initial Public Offering

In October 2018, the Company completed an IPO of its common stock, which resulted in the issuance and sale of an aggregate of 9,864,666 shares of common stock at a public offering price of $5.00 per share, generating net proceeds of $43.0 million after deducting underwriting discounts and commissions and other offering costs.

April 2019 Offering

In April 2019, the Company completed an underwritten public offering of its common stock, which resulted in the issuance and sale of an aggregate of 4,124,475 shares of common stock at a public offering price of $12.00 per share, generating net proceeds of $46.3 million after deducting underwriting discounts and commissions and other offering costs.

Shelf Registration Statement

In December 2019, the Company filed the 2019 Shelf Registration Statement on Form S-3, which became effective in January 2020. The 2019 Shelf Registration Statement permits: (i) the offering, issuance and sale by the Company of up to a maximum aggregate offering price of $200.0 million of common stock, preferred stock, debt securities and warrants in one or more offerings and in any combination; and (ii) the offering, issuance and sale by the Company of up to a maximum aggregate offering price of $60.0 million of the Company's common stock that may be issued and sold in “at-the-market” sales pursuant to the Equity Distribution Agreement. No securities have been sold under the 2019 Shelf Registration Statement and no shares have been sold pursuant to the Equity Distribution Agreement.