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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of the Company's restricted stock unit activity for the nine months ended September 30, 2018 is as follows:
 
Unvested Restricted
Stock Units
 
Weighted Average Grant Date Price Per Share (a)
Outstanding as of January 1, 2018
1,535,505

 
$3.19
Shares granted
1,892,903

 
$3.14
Shares vested
(190,117
)
 
$3.28
Shares forfeited
(427,970
)
 
$3.20
Outstanding at September 30, 2018
2,810,321

 
$3.16

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