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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Schedule of share-based payment award, stock options, valuation assumptions
The weighted average assumptions utilized to determine the fair value of options granted during the six months ended June 30, 2018 and 2017 were as follows:

 
 
 
 
 
Six Months Ended
June 30,
 
2018
 
2017
Risk-free interest rate
2.81
%
 
1.96
%
Expected volatility
36.60
%
 
35.53
%
Expected life (in years)
4.29

 
4.22

Dividend yield
0
%
 
0
%
Schedule of Share-based Compensation, Activity
The following table presents stock-based compensation expense, including expense for the ESPP, in the Company's consolidated statements of operations for the three and six months ended June 30, 2018 and 2017:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Cost of product sales
$
11

 
$
72

 
$
82

 
$
154

Cost of service sales
—

 
1

 
—

 
1

Research and development
149

 
170

 
319

 
359

Sales, marketing and support
166

 
221

 
347

 
489

General and administrative
413

 
388

 
844

 
809

 
$
739

 
$
852

 
$
1,592

 
$
1,812
Schedule of Accumulated Other Comprehensive Income (Loss)

 
Foreign Currency Translation
 
Unrealized Gain (Loss) on Available for Sale Marketable Securities
 
Interest Rate Swaps
 
Total Accumulated Other Comprehensive Loss
Balance, March 31, 2017
$
(16,050
)
 
$
—

 
$
(131
)
 
$
(16,181
)
Other comprehensive income (loss) before reclassifications
2,440

 
(3
)
 
(1
)
 
2,436

Amounts reclassified from AOCI to Other income, net 
—

 
—

 
19

 
19

Net other comprehensive income (loss), June 30, 2017
2,440

 
(3
)
 
18

 
2,455

Balance, June 30, 2017
$
(13,610
)
 
$
(3
)
 
$
(113
)
 
$
(13,726
)

The balances for the six months ended June 30, 2018 and 2017 are as follows:

 
Foreign Currency Translation
 
Unrealized Gain (Loss) on Available for Sale Marketable Securities
 
Interest Rate Swaps
 
Total Accumulated Other Comprehensive Loss
Balance, December 31, 2017
$
(11,247
)
 
$
(1
)
 
$
(69
)
 
$
(11,317
)
Other comprehensive (loss) income before reclassifications
(1,422
)
 
1

 
10

 
(1,411
)
Amounts reclassified from AOCI to Other income, net 
—

 
—

 
27

 
27

Net other comprehensive (loss) income, June 30, 2018
(1,422
)
 
1

 
37

 
(1,384
)
Balance, June 30, 2018
$
(12,669
)
 
$
—

 
$
(32
)
 
$
(12,701
)
 
 
Foreign Currency Translation
 
Unrealized Gain (Loss) on Available for Sale Marketable Securities
 
Interest Rate Swaps
 
Total Accumulated Other Comprehensive Loss
Balance, December 31, 2016
$
(16,651
)
 
$
—

 
$
(158
)
 
$
(16,809
)
Other comprehensive income (loss) before reclassifications
3,041

 
(3
)
 
4

 
3,042

Amounts reclassified from AOCI to Other income, net
—

 
—

 
41

 
41

Net other comprehensive income (loss), June 30, 2017
3,041

 
(3
)
 
45

 
3,083

Balance, June 30, 2017
$
(13,610
)
 
$
(3
)
 
$
(113
)
 
$
(13,726
)