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Equity Instruments and Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Compensation expense included in the Company’s Consolidated Statements of Income for all stock-based compensation arrangements was as follows:
 
 
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
 
 
Cost of products and services sold
 
$
-
 
$
38
 
$
20
 
Research and development expenses
 
 
1,587
 
 
1,027
 
 
779
 
Selling, general and administrative expenses
 
 
6,154
 
 
1,798
 
 
1,230
 
Total stock-based compensation expense
 
$
7,741
 
$
2,863
 
$
2,029
 
Schedule Of Share Based Payment Award Stock Options And Warrant Grants Valuation Assumptions [Table Text Block]
The weighted-average assumptions under the Black-Scholes option-pricing model for stock option and warrant grants are as follows:  
 
 
 
2015
 
2014
 
2013
 
Stock Option grants:
 
 
 
 
 
 
 
Expected term (years)
 
6.25
 
6.25
 
6.25
 
Expected volatility
 
58.59
%
59.00
%
58.15
%
Risk-free interest rate
 
1.89
%
1.79
%
1.66
%
Expected dividend yield
 
-
 
-
 
-
 
 
 
 
 
 
 
 
 
Warrant grants:
 
 
 
 
 
 
 
Expected term (years)
 
2.50
 
2.50
 
2.50
 
Expected volatility
 
55.00
%
58.00
%
54.00
%
Risk-free interest rate
 
0.89
%
0.75
%
0.47
%
Expected dividend yield
 
-
 
-
 
-
 
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
 
 
Wtd. Avg.
 
Wtd. Avg.
 
 
 
 
 
Number of
 
Exercise
 
Remaining
 
Aggregate
 
 
 
Stock
 
Price per
 
Contractual
 
Intrinsic
 
 
 
Options
 
Share
 
Life
 
Value
 
 
 
 
 
 
 
 
 
 
 
Stock options outstanding, January 1, 2015
 
2,498
 
$
11.45
 
 
 
 
 
 
Granted
 
934
 
 
16.71
 
 
 
 
 
 
Exercised
 
(708)
 
 
8.75
 
 
 
 
 
 
Forfeited
 
(398)
 
 
14.59
 
 
 
 
 
 
Stock options outstanding, December 31, 2015
 
2,326
 
$
13.84
 
8.26 years
 
$
6,426
 
Stock options exercisable, December 31, 2015
 
798
 
$
10.80
 
6.12 years
 
$
4,880
 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
A summary of the combined warrant activity and other data for the year ended December 31, 2015 is as follows:  
 
 
 
 
 
Wtd. Avg.
 
Wtd. Avg.
 
 
 
 
 
 
 
Exercise
 
Remaining
 
Aggregate
 
 
 
Number of
 
Price per
 
Contractual
 
Intrinsic
 
 
 
Warrants
 
Share
 
Life
 
Value
 
 
 
 
 
 
 
 
 
 
 
Warrants outstanding, January 1, 2015
 
553
 
$
10.47
 
 
 
 
 
 
Granted
 
305
 
 
21.67
 
 
 
 
 
 
Exercised
 
(190)
 
 
5.57
 
 
 
 
 
 
Forfeited
 
-
 
 
-
 
 
 
 
 
 
Warrants outstanding, December 31, 2015
 
668
 
$
16.97
 
2.90 years
 
$
687
 
Warrants exercisable, December 31, 2015
 
363
 
$
13.04
 
2.41 years
 
$
687
 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
A summary of the Company's free share awards as of December 31, 2015, and changes during the year then ended, is reflected in the table below.
 
 
 
Number of
 
Wtd. Avg.
 
 
 
Free Share
 
Grant Date
 
 
 
Awards
 
Fair Value
 
 
 
 
 
 
 
Nonvested free share awards outstanding, January 1, 2015
 
402
 
$
11.29
 
Granted
 
-
 
 
-
 
Vested
 
(151)
 
 
7.36
 
Forfeited
 
(25)
 
 
10.95
 
Nonvested free shares awards outstanding, December 31, 2015
 
226
 
$
13.95