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Equity Instruments and Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Compensation expense included in the Company’s consolidated statements of income (loss) for all stock-based compensation arrangements was as follows for the periods ended December 31: 
Stock-based Compensation Expense:
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
Cost of products and services sold
 
$
—

 
$
—

 
$
38

Research and development
 
3,523

 
1,587

 
1,027

Selling, general and administrative
 
11,156

 
6,154

 
1,829

Total stock-based compensation expense
 
$
14,679

 
$
7,741

 
$
2,894
Schedule Of Share Based Payment Award Stock Options And Warrant Grants Valuation Assumptions
The weighted-average assumptions under the Black-Scholes option-pricing model for stock option and warrant grants as of December 31, 2016, 2015 and 2014, are as follows:   
Stock Option and Warrant Assumptions:
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
Stock option grants:
 
 

 
 

 
 

Expected term (years)
 
6.25

 
6.25

 
6.25

Expected volatility
 
58.39
%
 
58.59
%
 
59.00
%
Risk-free interest rate
 
2.04
%
 
1.89
%
 
1.79
%
Expected dividend yield
 
—

 
—

 
—

 
 
 
 
 
 
 
Warrant grants:
 
 

 
 

 
 

Expected term (years)
 
2.50

 
2.50

 
2.50

Expected volatility
 
60.57
%
 
55.00
%
 
58.00
%
Risk-free interest rate
 
0.82
%
 
0.89
%
 
0.75
%
Expected dividend yield
 
—

 
—

 
—
Schedule of Share-based Compensation, Stock Options, Activity
A summary of the combined stock option activity and other data for the Company's stock option plans for the year ended December 31, 2016 is as follows:   
 Stock Option Activity and Other Data:
 
Number of Stock
Options
 
Weighted Average
Exercise Price per Share
 
Weighted Average
Remaining
Contractual Life
 
Aggregate
Intrinsic Value
 
 
 
 
 
 
 
 
 
Stock options outstanding, January 1, 2016
 
2,326

 
$
13.84

 
 
 
 

Granted
 
1,505

 
10.68

 
 
 
 

Exercised
 
(15
)
 
6.50

 
 
 
 

Forfeited
 
(6
)
 
14.35

 
 
 
 

Expired
 
(78
)
 
31.70

 
 
 
 
Stock options outstanding, December 31, 2016
 
3,732

 
$
12.07

 
8.48 years
 
$
3,681

Stock options exercisable, December 31, 2016
 
1,161

 
$
10.49

 
6.76 years
 
$
3,035
Schedule of Stockholders' Equity Note, Warrants or Rights
A summary of the combined warrant activity and other data for the year ended December 31, 2016 is as follows:   
 Warrant Activity and Other Data:
 
Number of
Warrants
 
Weighted Average Exercise Price per Share
 
Weighted Average Remaining
Contractual Life
 
Aggregate Intrinsic
Value
 
 
 
 
 
 
 
 
 
Warrants outstanding, January 1, 2016
 
668

 
$
16.97

 
 
 
 

Granted
 
291

 
13.59

 
 
 
 

Exercised
 
—

 
—

 
 
 
 

Forfeited
 
—

 
—

 
 
 
 

Expired
 
—

 
—

 
 
 
 
Warrants outstanding, December 31, 2016
 
959

 
$
16.05

 
2.47 years
 
$
276

Warrants exercisable, December 31, 2016
 
668

 
$
17.12

 
1.97 years
 
$
276
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
A summary of the Company's free share awards as of December 31, 2016, and changes during the year then ended, is reflected in the table below. 
 Free Share Activity and Other Data:
 
Number of Free Share Awards
 
Weighted Average Grant Date
Fair Value
 
 
 
 
 
Non-vested free share awards outstanding, January 1, 2016
 
226

 
$
13.95

Granted
 
463

 
12.11

Vested
 
(115
)
 
13.44

Forfeited
 
(1
)
 
16.27

Non-vested free shares awards outstanding, December 31, 2016
 
573

 
$
12.57