Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

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 June 30,
	2020		2019
2027 Notes		12,321,900		—
Shares issuable upon exercise of stock options		9,863,703		7,919,890
Non-vested shares under restricted stock grants		4,964,544		5,457,806