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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2013
Stockholders Equity Note [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity is as follows:
 
 
 
Outstanding stock options
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted
 
 
Number of
 
average exercise
 
 
shares
 
price
 
Balance at December 31, 2012
 
 
946,281
 
$
3.07
 
Options granted
 
 
354,027
 
 
4.29
 
Options exercised
 
 
(3,761)
 
 
2.81
 
Options forfeited
 
 
(8,610)
 
 
5.53
 
Options cancelled
 
 
(23,592)
 
 
11.25
 
Balance at December 31, 2013
 
 
1,264,345
 
 
3.25
 
 
 
 
 
 
 
 
 
Options exercisable at December 31, 2013
 
 
915,627
 
 
2.84
 
Schedule of Share-based Compensation, Activity [Table Text Block]
The following table summarizes information about stock options outstanding and exercisable at December 31, 2013:
 
Options outstanding
 
 
Options exercisable
 
 
 
Weighted
 
 
 
 
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
 
average
 
 
 
 
 
 
 
 
 
 
average
 
 
 
 
 
 
 
 
 
remaining
 
Weighted
 
 
 
 
 
 
 
remaining
 
Weighted
 
 
 
 
 
 
contractual
 
average
 
 
 
 
 
 
 
contractual
 
average
 
 
 
Number
 
life
 
exercise
 
Aggregate intrinsic
 
 
Number
 
life
 
exercise
 
Aggregate
 
outstanding
 
(Years)
 
price
 
value
 
 
exerciseable
 
(Years)
 
price
 
intrinsic value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1,264,345
 
 
7.65
 
$
3.25
 
$
6,330,494
 
 
915,627
 
 
7.15
 
$
2.84
 
$
4,960,933
 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
A summary of restricted common stock activity is as follows:
 
 
Number of unvested
 
 
restricted shares 
 
 
 
 
 
 
Balance at December 31, 2012
 
 
99,869
 
Granted
 
 
12,000
 
Vested
 
 
(7,763)
 
Cancelled
 
 
(322)
 
Balance at December 31, 2013
 
 
103,784
 
 
A summary of restricted stock unit activity is as follows:
 
 
Restricted
 
 
Stock Units
 
 
 
 
 
 
Balance at December 31, 2012
 
 
-
 
Granted
 
 
15,000
 
Vested
 
 
-
 
Cancelled
 
 
-
 
Balance at December 31, 2013
 
 
15,000