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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation Related Costs [Abstract]  
Schedule of stock option activity

The following table summarizes stock option activity during the six months ended June 30, 2017:
 
Number of
Shares
 
Weighted Average Exercise Price
Outstanding at December 31, 2016
2,569,550

 
$
9.53

Granted
—

 
$
—

Exercised
(23,555
)
 
$
7.21

Cancelled
(5,291
)
 
$
11.67

Outstanding at June 30, 2017
2,540,704

 
$
9.55

Vested and expected to vest at June 30, 2017
2,499,263

 
$
9.51

Exercisable at June 30, 2017
2,092,512

 
$
9.06
Summary of restricted stock award and restricted stock units activity
The Company’s restricted stock award and restricted stock unit activity for the six months ended June 30, 2017 was as follows:
 
Restricted Stock Awards
 
Restricted Stock Units
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 2016
156

 
$
11.19

 
1,766,123

 
$
7.18

Granted
—

 
$
—

 
1,111,130

 
$
10.85

Vested
(156
)
 
$
11.19

 
(493,697
)
 
$
6.55

Cancelled
—

 
$
—

 
(56,977
)
 
$
9.03

Unvested at June 30, 2017
—

 
$
—

 
2,326,579

 
$
9.02
Schedule of Market-Based Stock Units Activity
The Company’s market-based stock unit activity for the six months ended June 30, 2017 was as follows:
 
Market-Based Stock Units
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 2016
150,871

 
$
11.10

Units granted
166,434

 
$
13.82

Vested
—

 
$
—

Cancelled
—

 
$
—

Unvested at June 30, 2017
317,305

 
$
12.53
Market-Based Stock Units Valuation Assumptions
The fair value of these market-based stock units was estimated on the date of grant using the Monte Carlo Simulation Valuation Model, which estimates the potential outcome of achieving the market condition based on simulated future stock prices, with the following assumptions for the six months ended June 30, 2017:
 
Six Months Ended
 
June 30,
 
2017
 
2016
Expected volatility
54
%
 
49
%
Risk-free interest rate
1.50
%
 
0.90
%
Expected dividend
—
%
 
—
%
Weighted average fair value
$
13.82

 
$
4.94