Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Net Loss Per Share

The table below provides potentially dilutive securities not included in the calculation of the diluted net loss per share because to do so would be anti-dilutive:

	December 31,
	2019		2018		2017
Shares issuable upon conversion of Series Seed Convertible    Preferred Stock		—		4,444,444		—
Shares issuable upon conversion of Series A Convertible    Preferred Stock		—		10,158,710		—
Shares issuable upon conversion of Series B Convertible    Preferred Stock		—		15,890,306		—
Shares issuable upon exercise of stock options		8,538,060		5,107,329		—
Non-vested shares under restricted stock grants		4,648,526		7,482,032		1,305,421