Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of Restricted Stock Unit Activity

The following table summarizes the Company's RSU activity under the Incentive Award Plan during the years ended December 31, 2019, 2018 and 2017:

	Unvested Time-Based RSUs	Unvested Performance-Based RSUs	Weighted Average Grant Date Value Per Share (a)
Outstanding as of January 1, 2017	1,646,523	—	$3.29
Shares granted	2,019,078	—	$3.29
Shares vested	(1,750,773)	—	$3.38
Shares forfeited	(379,323)	—	$3.25
Outstanding as of December 31, 2017	1,535,505	—	$3.19
Shares granted	1,950,307	—	$3.14
Shares vested	(1,349,852)	—	$3.20
Shares forfeited	(587,810)	—	$3.19
Outstanding as of December 31, 2018	1,548,150	—	$3.18
Shares granted	1,225,170	1,450,811	$3.14
Shares vested	(1,275,188)	—	$3.18
Shares forfeited	(202,441)	(61,169)	$3.17
Outstanding as of December 31, 2019	1,295,691	1,389,642	$3.14

(a)

On an annual basis, the Company engages an independent third-party valuation advisory consulting firm to estimate the value per share of the Company's common stock.