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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jan. 01, 2018
Contract with Customer, Liability, Revenue Recognized $ 5,700 $ 16,400  
Revenue, Remaining Performance Obligation 25,000 25,000  
Contract with Customer, Liability, Current $ 13,900 $ 13,900 $ 20,737
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   2 years  
Minimum [Member]      
License Agreement, Term of Agreement   1 year  
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate 3.00% 3.00%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   1 year  
Maximum [Member]      
License Agreement, Term of Agreement   7 years  
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate 6.00% 6.00%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   3 years