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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

The Company recognized total stock-based compensation expense during the three and six months ended June 30, 2020 and 2019 as follows:

A summary of the Company’s restricted stock awards during the six months ended June 30, 2020 is as follows:

A summary of the Company’s restricted stock awards during the six months ended June 30, 2019 is as follows:

A summary of the Company’s service-based restricted stock units during the six months ended June 30, 2020 is as follows:



	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested at January 1, 2020	463,786		$	4.26
Granted	188,904		2.09
Vested	(128,460	)	4.30
Forfeited	(104,168	)	4.66
Unvested at June 30, 2020	420,062		$	3.27

A summary of the Company’s service-based restricted stock units during the six months ended June 30, 2019 is as follows:



	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested at January 1, 2019	472,959		$	4.32
Granted	199,938		4.45
Forfeited	(3,650	)	4.81
Unvested at June 30, 2019	669,247		$	4.36

A summary of the Company’s performance-based restricted stock units during the six months ended June 30, 2020 is as follows:



	Number of Shares	Weighted Average Grant-Date Fair Value
Unvested at January 1, 2020	988,958	$	4.48
Forfeited	(905,625)	4.61
Unvested at June 30, 2020	83,333	$	3.09

A summary of the Company’s performance-based restricted stock units during the six months ended June 30, 2019 is as follows:

The fair value of the service-based stock options granted for the six months ended June 30, 2020 were based on the following assumptions:



	June 30, 2020
Exercise price	$1.77 - $2.45
Expected stock price volatility	68.2% - 74.4%
Risk-free interest rate	0.35% - 1.65%
Term (years)	5.5 -6.5

A summary of the Company’s service-based stock option activity for the six months ended June 30, 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	1,610,344		2.24		5.9	—
Forfeited	(211,471	)	4.41		—	—
Expired	(3,983,335	)	8.30		—	—
Outstanding at June 30, 2020	5,625,562		$	4.90	6.7	$	1,100

Exercisable at June 30, 2020	2,809,954		$	7.09	4.3	$	—

A summary of the Company’s service-based stock option activity for the six months ended June 30, 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	523,105		4.33		9.7	—
Exercised	(30,000	)	4.93		—	—
Forfeited	(550,549	)	6.67		—	—
Outstanding at June 30	7,799,036		$	7.36	5.4	$	2,500

Exercisable at June 30, 2019	6,183,193		$	8.16	4.3	$	—

A summary of the performance-based stock options for the six months ended June 30, 2020 is as follows:



	Number of Shares		Weighted Average Exercise Price
Outstanding at January 1, 2020	388,125		$	4.70
Granted	600,000		2.45
Forfeited	(388,125	)	4.70
Outstanding at June 30, 2020	600,000		$	2.45

Exercisable at June 30, 2020	—		$	—

A summary of the performance-based stock options for the six months ended June 30, 2019 is as follows:



	Number of Shares	Weighted Average Exercise Price
Outstanding at January 1, 2019	388,125	$	4.70
Outstanding at June 30, 2019	388,125	$	4.70

Exercisable at June 30, 2019	—	$	—

Number of Shares

Weighted Average
Grant-Date
Fair Value

Unvested at January 1, 2020

Unvested at June 30, 2020