Preferred and Common Stock - Additional Information (Details) $ / shares in Units, $ in Thousands		9 Months Ended
	May 05, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) Vote $ / shares shares	May 31, 2020 shares	Jan. 31, 2020 $ / shares	Jan. 10, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares
Class Of Stock [Line Items]
Common stock, shares authorized	200,000,000	200,000,000			400,000,000	275,000,000
Common stock, par value per share | $ / shares	$ 0.001	$ 0.001			$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	100,000,000
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.001
Common stock, voting rights		The holders of common stock are entitled to one vote for each share held.
Number of common stock voting rights | Vote		1
Reverse stock split of issued and outstanding common stock		one-for-34.483
Net proceeds from initial public offering | $		$ 59,892
Common stock shares issued		12,924,817				230,860
Series C Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Shares issued and sold, public offering price | $ / shares				$ 0.38811
Common Stock
Class Of Stock [Line Items]
Issuance of common stock from initial public offering, net of issuance costs, Shares		4,025,000
Gross proceeds from initial public offering | $	$ 64,400
Net proceeds from initial public offering | $	$ 57,300
Preferred stock converted into common stock	8,335,248
Number of warrants issued to purchase common stock	313,794	681,256
Warrants exercise price, per share | $ / shares		$ 8.63
Common Stock | Director
Class Of Stock [Line Items]
Vested share of common stock	19,661
Warrants | Series C Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Net proceeds from issuance of preferred stock allocated to warrants | $		$ 700
IPO
Class Of Stock [Line Items]
Common stock shares issued			313,794
IPO | Common Stock
Class Of Stock [Line Items]
Issuance of common stock from initial public offering, net of issuance costs, Shares	4,025,000
Shares issued and sold, public offering price | $ / shares	$ 16.00
Exercise of Underwriters' Option | Common Stock
Class Of Stock [Line Items]
Issuance of common stock from initial public offering, net of issuance costs, Shares	525,000