Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 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:

	As of September 30,
	2019		2018
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		8,099,861		2,104,311
Non-vested shares under restricted stock grants		5,053,169		7,799,605