Warrants (Tables)

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Summary of Warrant Activity

A summary of warrant activity during the six months ended June 30, 2020 is as follows:

Warrants outstanding, December 31, 2019	10,384,706
Warrants issued due to anti-dilution features triggered from Registered Direct Offering	1,358
Exercises	(8,235,779	)
Warrants outstanding, June 30, 2020	2,150,285

Summary of Periodic Changes in Fair Value of Warrant Liability

For warrants classified as a liability, the following is a summary of the periodic changes in their fair value during the six months ended June 30, 2020:

Balance, December 31, 2019	$	10,000
Changes in fair value		—
Balance, June 30, 2020	$	10,000