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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of restricted stock activity
The following table summarizes the restricted stock activity under the Company's equity incentive plans :
 
Number
of
Shares
 
Weighted
Average
Fair Value
Per Share
Nonvested at January 1, 2016
120,154

 
$
9.28

Granted
407,002

 
$
4.96

Vested
(147,259
)
 
$
6.62

Forfeited/repurchased shares
(7,591
)
 
$
7.08

Nonvested at December 31, 2016
372,306

 
$
5.66

Granted
345,913

 
$
7.22

Vested
(225,406
)
 
$
7.25

Forfeited/repurchased shares
(120,353
)
 
$
6.08

Nonvested at December 31, 2017
372,460

 
$
6.01

Granted
333,864

 
$
7.47

Vested
(217,244
)
 
$
6.61

Forfeited/repurchased shares
(71,139
)
 
$
6.85

Nonvested at December 31, 2018
417,941

 
$
7.04
Schedule of stock options activity
The following table summarizes the stock option activity under the Company's equity incentive plans:

 
Number
of
Shares
 
Weighted
Average
Exercise
Price
Per Share
 
Weighted
Average
Contractual
Life
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2016
2,149,900

 
$
9.56

 
 
 
 

Granted
587,862

 
$
4.98

 
 
 
 

Exercised
(13,850
)
 
$
4.86

 
 
 
 

Forfeited
(374,466
)
 
$
9.89

 
 
 
 

Outstanding at December 31, 2016
2,349,446

 
$
8.39

 
 
 
 

Granted
425,204

 
$
7.22

 
 
 
 

Exercised
(229,551
)
 
$
5.75

 
 
 
 

Forfeited
(633,978
)
 
$
10.36

 
 
 
 

Outstanding at December 31, 2017
1,911,121

 
$
7.79

 
 
 
 

Granted
374,215

 
$
7.49

 
 
 
 

Exercised
(488,303
)
 
$
5.76

 
 
 
 

Forfeited
(132,252
)
 
$
7.89

 
 
 
 

Outstanding at December 31, 2018
1,664,781

 
$
8.31

 
 
 
 

 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2017
1,779,990

 
$
8.15

 
5.83
 
$
15

Exercisable at December 31, 2018
1,247,450

 
$
8.56

 
4.51
 
$
14
Schedule of stock option valuation assumptions
The Company calculates the fair value of each option on the date of grant using the Black-Scholes pricing model and the following weighted-average assumptions in each year:
 
2018
 
2017
 
2016
Weighted average grant-date fair value of options granted
$
2.78

 
$
7.22

 
$
4.97

Risk-free interest rate
2.65
%
 
1.46
%
 
1.06
%
Expected volatility
51.8
%
 
48
%
 
49
%
Expected term of options (in years)
3.0

 
3.0

 
3.0

Dividend yield
—
%
 
—
%
 
—
%
Schedule of intrinsic value of options exercised and fair value of shares vested
 
2018
 
2017
 
2016
Total intrinsic value of options exercised
$
1,286

 
$
706

 
$
53

Total fair value of shares vested
$
705

 
$
855

 
$
986