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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Valuation Assumptions
The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing formula that uses assumptions noted in the following table. Expected volatilities and risk-free interest rates are based upon the expected life of the grant.
 
Six months ended June 30,
Assumptions
2018
 
2017
Expected dividends
—

 
—

Risk-free rate
2.36
%
 
1.55
%
Expected volatility
60.5% - 62.3%

 
58.0% - 69.7%

Expected term (in years)
3.2 - 3.3 years

 
3.2 - 3.3 years
Schedule of Stock Option Activity
A summary of option activity under the Director Plan, the 2009 Plan and the 2016 Plan as of June 30, 2018 and changes during the period are presented below:
 
Number of
Options
 
Weighted Average
Exercise Price
Outstanding as of January 1, 2018
4,299,810

 
$
5.09

Issued
679,785

 
3.29

Exercised
(11,000
)
 
1.08

Forfeited
(200,490
)
 
7.02

Expired
—

 
—

Outstanding as of June 30, 2018
4,768,105

 
$
4.76

 


 
 
Exercisable as of June 30, 2018
3,546,700

 
$
4.63
Schedule of Stock Options Outstanding and Exercisable
The following tables summarize information regarding options outstanding and exercisable at June 30, 2018:
 
Outstanding:
Range of Exercise Prices
 
Stock Options Outstanding
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life
$0.55 - $1.50
 
1,735,000

 
$
1.06

 
3.61
$1.51 - $5.50
 
873,469

 
3.18

 
8.52
$5.51 - $10.67
 
2,159,636

 
8.38

 
7.45
Total
 
4,768,105

 
$
4.76

 
6.25


Exercisable: 
Range of Exercise Prices
 
Stock Options Exercisable
 
Weighted Average Exercise Price
$0.55 - $1.50
 
1,735,000

 
$
1.06

$1.51 - $5.50
 
202,166

 
2.75

$5.51 - $10.67
 
1,609,534

 
8.72

Total
 
3,546,700

 
$
4.63
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes the number of unvested RSUs and their weighted average exercise price for the six months ended June 30, 2018.
 
 
Number of RSUs
 
Weighted Average Exercise Price
Non-vested balance at January 1, 2018
 
188,629

 
$
8.27

Changes during the period:
 
 

 
 

Shares granted
 
122,949

 
3.36

Shares vested
 
(101,607
)
 
9.07

Shares forfeited
 
(11,123
)
 
7.21

Non-vested balance at June 30, 2018
 
198,848

 
$
4.88