Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2021

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,
	2021	2020
2027 Notes	12,321,900	12,321,900
Shares issuable upon exercise of stock options	10,435,930	9,863,703
Non-vested shares under restricted stock grants	3,385,821	4,964,544