Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

A summary of the Company’s employee and non-employee stock option activity for the three months ended March 31, 2020 is presented below:

	Number of Shares			Weighted-Average Exercise Price
Outstanding – December 31, 2019		4,529,988		$	15.26
Granted		117,632		$	2.54
Exercised		(10,000	)	$	3.12
Forfeited		(289,061	)	$	17.13
Outstanding – March 31, 2020		4,348,559		$	14.80
Options exercisable, March 31, 2020		3,584,300		$	14.84

Schedule of Share-based Compensation Related to Restricted Stock Awards and Stock Options

The stock-based compensation expense related to stock options, restricted stock awards, and the employee stock purchase plan was as follows (in thousands):

	For the Three Months Ended March 31
	2020			2019
General and administrative expense	$	3,076		$	9,037
Research and development expense		(36	)		1,084
Sales and marketing expense		181			168
Total stock-based compensation expense	$	3,221		$	10,289

Schedule of Share-based Compensation, Restricted Stock Activity

A summary of the Company’s employee and non-employee restricted-stock activity is presented below:

	Number of Shares
Unvested - December 31, 2019		1,843,001
Granted		188,944
Vested (1)		(452,067	)
Forfeited		(5,000	)
Unvested – March 31, 2020		1,574,878

(1) The number of vested restricted stock units includes shares that were withheld on behalf of employees to satisfy the minimum statutory tax withholding requirements.