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Summary of Significant Accounting Policies - Revenue Recognition and Product Warranty (Details)
 12 Months Ended
Dec. 31, 2017
Minimum  
Product Information [Line Items]  
Time based licenses, term revenue recognized 2 years
Range of product warranty 30 days
Maximum  
Product Information [Line Items]  
Time based licenses, term revenue recognized 5 years
Range of product warranty 3 years