Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of Stockholders' Equity Note, Warrants or Rights

The following table summarizes warrant activity for the years ended December 31, 2019, 2018 and 2017 as follows:

	Number of Warrants
	Equity classified		Liability classified	Total		Weighted average exercise price
Outstanding at December 31, 2017	176,432		—	176,432		$	17.32
Issuance	—		—	—		—
Exercises	—		—	—		—
Expirations/ cancellations	(80,813	)	—	(80,813	)	17.55
Outstanding at December 31, 2018	95,619		—	95,619		17.12
Issuance	8,342,128		22,988,501	31,330,629		1.07
Exercises	—		—	—		—
Expirations/ cancellations	—		—	—		—
Outstanding at December 31, 2019	8,437,747		22,988,501	31,426,248		$	1.12

Schedule of Authorized Shares of Common Stock for Future Issuance

The Company has authorized shares of common stock for future issuance as follows:

	Period ending
	December 31, 2019	December 31, 2018
Exercise of common and pre-funded warrants	31,426,248	95,619
Shares available for future stock incentive awards	1,765,018	1,586,925
Unvested restricted stock units	181,250	175,000
Outstanding common stock options	6,796,669	4,093,979
Total	40,169,185	5,951,523