Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Schedule of Stock Based Compensation Expense

Stock-based compensation expense was as follows for the three and six months ended June 30, 2020 and 2019 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Restricted stock units	$	679	$	235	$	1,068	$	3,328
Performance units		448		231		691		2,990
Restricted and unrestricted stock		637		86		865		235
Total expense	$	1,764	$	552	$	2,624	$	6,553

Summary of Employee Restricted Stock Unit Awards Activity

A summary of employee restricted stock unit awards activity during the six months ended June 30, 2020 is as follows:

	Number of units			Weighted average grant date fair value		Aggregate intrinsic value (in thousands)
Total awarded and unvested, December 31, 2019		437,559		$	7.83	$	3,474
Granted		351,467			5.86
Vested		(214,804	)		9.14
Forfeited		—			—
Total awarded and unvested, June 30, 2020		574,222		$	6.14	$	2,268

Summary of Performance Stock Unit Awards Activity

A summary of performance stock unit awards activity during the six months ended June 30, 2020 is as follows

	Number of units			Weighted average grant date fair value		Aggregate intrinsic value (in thousands)
Total awarded and unvested, December 31, 2019		320,120		$	11.26	$	2,522
Granted		618,483			6.21
Vested		(51,858	)		20.89
Forfeited		(55,547	)		16.69
Total awarded and unvested, June 30, 2020		831,198		$	6.54	$	837

Performance Units [Member]

Summary of Assumptions to Determine Fair Value for Performance Stock Units Granted

The following table presents the assumptions used to determine the fair value for performance stock units granted during the six months ended June 30, 2020 and 2019:

	Six Months Ended June 30,
	2020			2019
Volatility		79.70	%		65.10	%
Risk-free interest rate		0.20	%		1.83	%