Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

The Company recognized total stock-based compensation expense during the three months ended March 31, 2020 and 2019 as follows:

A summary of the Company’s restricted stock awards during the three months ended March 31, 2020 is as follows:

A summary of the Company’s restricted stock awards during the three months ended March 31, 2019 is as follows:

A summary of the Company’s service based restricted stock units during the three months ended March 31, 2020 is as follows:



	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested at January 1, 2020	463,786		4.26
Granted	16,304		2.61
Forfeited	(7,460	)	4.15
Unvested at March 31, 2020	472,630		4.21

A summary of the Company’s service based restricted stock units during the three months ended March 31, 2019 is as follows:

A summary of the Company’s performance based restricted stock units during the three months ended March 31, 2020 is as follows:

A summary of the Company’s performance based restricted stock units during the three months ended March 31, 2019 is as follows:

The fair value of the service based stock options granted for the three months ended March 31, 2020 were based on the following assumptions:



	March 31, 2020
Exercise price	$2.00 - $2.90
Expected stock price volatility	68.2% - 73.8%
Risk-free interest rate	0.4% - 1.67%
Term (years)	5.5 -6.5

A summary of the Company’s service based stock option activity for the three months ended March 31, 2020 is as follows:



	Shares Underlying Options		Weighted Average Exercise Price			Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2020	8,210,024		$	7.06		5.1	$	107,150
Granted	51,148		$	2.30		9.9	$	—
Forfeited	(457,334	)	$	(7.02	)	—	$	—
Outstanding at March 31, 2020	7,803,838		$	7.03		5.1	$	1,950

Exercisable at March 31, 2020	6,146,337		$	7.97		4.1	$	—

A summary of the Company’s service based stock option activity for the three months ended March 31, 2019 is as follows:



	Shares Underlying Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2019	7,856,480		$	7.50	5.2	$	—
Granted	75,000		$	3.49	9.8
Exercised	(30,000	)	$	4.93	—
Outstanding at March 31, 2019	7,901,480		$	7.47	5.0	$	1,959,736

Exercisable at March 31, 2019	6,707,693		$	8.05	4.2	$	206,872

A summary of the performance based stock options for the three months ended March 31, 2020 is as follows:



	Number of Shares	Weighted Average Exercise Price
Outstanding at January 1, 2020	388,125	$	4.70
Outstanding at March 31, 2020	388,125	$	4.70

Exercisable at March 31, 2020	—	$	—

A summary of the performance based stock options for the three months ended March 31, 2019 is as follows:



	Number of Shares	Weighted Average Exercise Price
Outstanding at January 1, 2019	388,125	$	4.70
Outstanding at March 31, 2019	388,125	$	4.70

Exercisable at March 31, 2019	—	$	—

Number of Shares

Weighted Average
Grant-Date
Fair Value

Unvested at January 1, 2020

Unvested at March 31, 2020