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Restricted Stock Units (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Summary of Restricted Stock Unit Activity

The following is a summary of the RSU activity for the years ended December 31, 2018, 2017 and 2016:

 

 

 

 

 

 

 

Weighted

 

 

 

Number of

 

 

Average

 

 

 

Restricted

 

 

Grant

 

 

 

Stock Units

 

 

Date Fair

 

 

 

Outstanding

 

 

Value

 

Unvested, December 31, 2015

 

 

422,500

 

 

$

3.64

 

Granted

 

 

660,331

 

 

 

3.74

 

Vested

 

 

(187,503

)

 

 

4.53

 

Unvested, December 31, 2016

 

 

895,328

 

 

$

3.53

 

Granted

 

 

3,873,000

 

 

 

0.82

 

Vested

 

 

(337,618

)

 

 

3.46

 

Forfeited

 

 

(36,054

)

 

 

3.60

 

Unvested, December 31, 2017

 

 

4,394,656

 

 

$

1.15

 

Granted

 

 

2,215,151

 

 

 

2.20

 

Vested

 

 

(1,605,997

)

 

 

1.34

 

Forfeited

 

 

(36,666

)

 

 

1.36

 

Unvested, December 31, 2018

 

 

4,967,144

 

 

$

1.56