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Equity Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of expenses related to share-based payments
The following table highlights the expense related to share-based payments for the years ended December 31, 2013, 2012 and 2011:
 
 
2013
 
2012
 
2011
Nonvested stock
 
$
512

 
$
580

 
$
127

Stock options
 
511

 
383

 
257

Restricted stock units
 
26

 
—

 
—

Stock purchases
 
—

 
342

 
—

Stock based compensation
 
$
1,049

 
$
1,305

 
$
384
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The Company used the following assumptions to value the stock options issued during the years ended December 31, 2013, 2012 and 2011:
 
2013
 
2012
 
2011
Expected dividend yield
0
%
 
0
%
 
0
%
Expected volatility factor (a)
49% - 51%

 
58
%
 
59
%
Risk-free interest rate (b)
1.8% - 2.0%

 
0.8% - 0.9%

 
1.0
%
Expected term (in years) (c)
6.0 - 6.5

 
3.7 - 3.9

 
4.3
(a)    The Company estimated its volatility factor based on the average volatilities of similar public entities.
(b)    The risk-free interest rate is based on U.S. Treasury yields in effect at the time of grant.
(c)    For stock options granted during the year ended December 31, 2013, the expected term was derived utilizing the
"simplified method" in accordance with Securities and Exchange Commission Staff Accounting Bulletin No. 110, which uses the mid-point between the vesting date and the expiration date of the award. We believe use of this approach is appropriate given the lack of prior history of option exercises upon which to base an expected term. For stock options granted during the years ended December 31, 2012 and 2011, the expected term was based on the vesting term and contractual term of the options and the expected exercise behavior of the option holders.
Schedule of nonvested stock awards and restricted stock units awards
The following is a summary of nonvested stock and restricted stock unit activity:
 
Nonvested Stock
 
Restricted Stock Units
 
Number of
shares
outstanding
 
Weighted
average
grant date
fair value
 
Number of
units
outstanding
 
Weighted
average
grant date
fair value
December 31, 2010
1,123,289

 
$
1.06

 
—

 
$
—

Granted
64,930

 
1.92

 
—

 
—

Vested
(181,804
)
 
0.98

 
—

 
—

Forfeited
(337,636
)
 
1.16

 
—

 
—

December 31, 2011
668,779

 
1.11

 
—

 
—

Granted
234,086

 
1.98

 
—

 
—

Vested
(448,355
)
 
1.51

 
—

 
—

Forfeited
(58,437
)
 
1.92

 
—

 
—

December 31, 2012
396,073

 
1.06

 
—

 
—

Granted
593,878

 
16.78

 
10,000

 
13.96

Vested
(561,958
)
 
6.51

 
—

 
—

Forfeited
—

 
—

 
—

 
—

December 31, 2013
427,993

 
$
15.72

 
10,000

 
$
13.96
Schedule of stock options
The following is a summary of stock option award activity:
 
Number of options
 
Weighted average exercise price
 
Contractual term (in years)
 
Intrinsic value
Outstanding at December 31, 2010
845,259

 
$
2.05

 
 
 
 
Granted
64,930

 
1.92

 
 
 
 
Exercised
—

 
—

 
 
 
 
Forfeited/Canceled
—

 
—

 
 
 
 
Outstanding at December 31, 2011
910,189

 
2.04

 
 
 
 
Granted
1,006,936

 
0.97

 
 
 
 
Exercised
—

 
—

 
 
 
 
Forfeited/Canceled
(1,144,274
)
 
1.82

 
 
 
 
Outstanding at December 31, 2012
772,851

 
0.97

 
 
 
 
Granted
489,377

 
14.17

 
 
 
 
Exercised
(546,244
)
 
0.97

 
 
 
 
Forfeited/Canceled
(1,500
)
 
14.00

 
 
 
 
Outstanding at December 31, 2013
714,484

 
$
9.98

 
9.0
 
$
5,883

 
 
 
 
 
 
 
 
Exercisable at December 31, 2013
94,083

 
$
0.97

 
6.9
 
$
1,623

 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2013
635,276

 
$
9.59

 
8.9
 
$
5,480
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
The following table summarizes the Company’s total unrecognized compensation cost related to equity based compensation as of December 31, 2013:
 
 
Unrecognized compensation cost
 
Weighted average remaining period of expense recognition (in years)
Nonvested stock
 
$
1,058

 
2.1
Stock options
 
2,655

 
2.8
Restricted stock units
 
113

 
1.6
 
 
$
3,826