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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2015
235,863

 
$
8.63

Granted
38,660

 
$
5.82

Vested
(134,545
)
 
$
6.84

Forfeited/repurchased shares
(19,824
)
 
$
11.35

Nonvested at December 31, 2015
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
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, 2015
2,056,898

 
$
9.86

 
 
 
 

Granted
143,862

 
$
5.82

 
 
 
 

Exercised
(3,970
)
 
$
6.00

 
 
 
 

Forfeited
(46,890
)
 
$
11.72

 
 
 
 

Outstanding at December 31, 2015
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

 
 
 
 

 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2017
2,024,130

 
$
7.69

 
5.26
 
$
2,872

Exercisable at December 31, 2017
1,462,481

 
$
8.18

 
3.82
 
$
2,054
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:
 
2017
 
2016
 
2015
Weighted average grant-date fair value of options granted
$
7.22

 
$
4.97

 
$
5.82

Risk-free interest rate
1.46
%
 
1.06
%
 
0.97
%
Expected volatility
48
%
 
49
%
 
38
%
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
 
2017
 
2016
 
2015
Total intrinsic value of options exercised
$
706

 
$
53

 
$
17

Total fair value of shares vested
$
855

 
$
986

 
$
1,226