Common Stock Warrants - Schedule of Common Stock Warrants Issued and Outstanding (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	134,716
The February 2014 Common stock warrant
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	50,716
Issuance Date	2014-02
Price per Share | $ / shares	$ 0.1700
Expiration Date	2021-02
The June 2017 Common stock warrant
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	84,000	[1]
Issuance Date	2017-06	[1]
Price per Share | $ / shares	$ 13.2000	[1]
Expiration Date	2020-06	[1]

[1] This warrant was issued to the Company’s lead underwriter in connection with the Company’s initial public offering.