Annual report pursuant to Section 13 and 15(d)

SIGNIFICANT ACCOUNTING POLICIES - Type of Revenue Arrangement (Details)

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SIGNIFICANT ACCOUNTING POLICIES - Type of Revenue Arrangement (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]      
Percentage of total recognized revenue by type of arrangement 100.00% 100.00% 100.00%
Sale of products      
Disaggregation of Revenue [Line Items]      
Percentage of total recognized revenue by type of arrangement 94.30% 96.20% 95.30%
Maintenance and support agreements      
Disaggregation of Revenue [Line Items]      
Percentage of total recognized revenue by type of arrangement 3.70% 3.20% 4.30%
Long term research and development contracts      
Disaggregation of Revenue [Line Items]      
Percentage of total recognized revenue by type of arrangement 2.00% 0.60% 0.40%