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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2015
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
 
 
Number of
 
Weighted average
 
 
shares
 
exercise price
 
Balance at December 31, 2014
 
1,528,737
 
$
4.20
 
Options granted
 
301,500
 
 
9.60
 
Options exercised
 
(98,574)
 
 
2.81
 
Options forfeited
 
(8,555)
 
 
6.29
 
Options cancelled
 
(556)
 
 
18.34
 
Balance at December 31, 2015
 
1,722,552
 
 
5.21
 
 
 
 
 
 
 
 
Options exercisable at December 31, 2015
 
1,238,423
 
 
3.72
 
Schedule of Share-based Compensation, Activity [Table Text Block]
The following table summarizes information about stock options outstanding and exercisable at December 31, 2015:
 
Options outstanding
 
Options exercisable
 
Number
outstanding
 
Weighted
average
remaining
contractual 
life
(Years)
 
Weighted
average
exercise 
price
 
Aggregate intrinsic
value
 
Number
exerciseable
 
Weighted
average
remaining
contractual
life
(Years)
 
Weighted
average 
exercise
price
 
Aggregate
Intrinsic
value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1,722,552
 
 
6.38
 
$
5.21
 
$
13,363,290
 
 
1,238,423
 
 
5.31
 
$
3.72
 
$
11,402,022
 
Restricted Stock [Member]  
Stockholders Equity Note [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of restricted common stock activity is as follows:
 
 
 
Number of
 
 
 
unvested restricted
 
 
 
shares
 
 
 
 
Balance at December 31, 2014
 
 
7,000
 
Granted
 
 
-
 
Vested
 
 
(4,000)
 
Cancelled
 
 
-
 
Balance at December 31, 2015
 
 
3,000