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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Stock-Based Compensation
A summary of the Company's restricted stock unit activity for the three months ended March 31, 2019 is as follows:
 
Unvested Restricted
Stock Units
 
Weighted Average Grant Date Price Per Share (a)
Outstanding as of January 1, 2019
1,548,150

 
$3.18
Shares forfeited
(10,196
)
 
$3.19
Outstanding at March 31, 2019
1,537,954

 
$3.18

(a)
On an annual basis, the Company engages an independent third-party valuation advisory firm to estimate the per share value of the Company's common stock.
As of March 31, 2019, there was $3,626 of total unrecognized compensation expense related to unvested stock-based compensation arrangements that vest through December 2019 and 2020, as applicable. The Company recognized stock-based compensation expense of $845 and $868 for the three months ended March 31, 2019 and 2018, respectively. Stock-based compensation expense is recognized on a straight-line basis over the vesting period and forfeitures of stock-based awards are recognized as they occur.