Convertible Preferred Stock and Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Summary of Reserved Shares of Common Stock

The Company has reserved shares of common stock for conversion of convertible preferred stock, exercise of warrants, and the issuance of options granted under the Company’s stock option plan and its stock purchase plan as follows:

	December 31, 2019		December 31, 2018
Warrants		46,155		1,131,151
Series A Convertible Preferred Stock		46,398,904		47,844,562
Series B Convertible Preferred Stock		5,610,121		-
Stock award plans		3,216,028		4,438,503
Employee Stock Purchase Plan		261,603		51,251
		55,532,811		53,465,467

Summary of Option and Stock Appreciation Rights Activity

A summary of the option and stock appreciation rights activity for the year ended December 31, 2019 is as follows:

	Number of Options/SARs			Range of Exercise Price		Weighted Average Exercise Price per Share
Outstanding, December 31, 2018		1,165,086			$0.74 - $43.90	$	2.54
Granted		1,027,000			$2.03 - $4.48	$	2.12
Exercised		(134,313	)		$0.74 - $2.15	$	1.17
Forfeited		(200,174	)		$0.74 - $43.90	$	4.29
Outstanding, December 31, 2019		1,857,599			$0.74 - $36.20	$	2.22

Summary of Option and Stock Appreciation Rights Outstanding by Range of Exercise Price

A summary of the options and stock appreciation rights outstanding by range of exercise price is as follows:

	Year Ended December 31, 2019
							Number of		Weighted
			Weighted		Weighted		Options		Average Exercise
	Options		Average		Average		Currently		Price Per Vested
Range of Exercise Prices	Outstanding		Remaining Life		Exercise Price		Exercisable		Share
$0.00 - $1.00		656,444		8.17	$	0.74		265,366	$	0.74
$1.01 - $2.00		96,333		6.78	$	1.50		62,794	$	1.73
$2.01- $4.00		957,477		8.83	$	2.05		83,477	$	2.15
$4.01 - $10.00		117,500		5.94	$	4.17		82,500	$	4.04
$10.01 - $20.00		-		-	$	-		-	$	-
$30.01 - $40.00		29,845		0.91	$	34.73		29,845	$	34.73
		1,857,599		8.18	$	2.22		523,982	$	3.54

Summary of Restricted Stock Unit Activity

A summary of the restricted stock unit activity for the year ended December 31, 2019 is as follows:

	Number of Restricted Stock Units			Weighted Average Grant Date Fair Value per Unit
Outstanding, December 31, 2018		647,649		$	0.83
Granted		420,000		$	1.98
Vested		(207,212	)	$	1.36
Forfeited		(19,725	)	$	0.74
Outstanding, December 31, 2019		840,712		$	1.28