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Revenue Recognition - Estimated Revenue Expected to be Recognized in Future Related to Performance Obligations (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Product revenue | Remainder 2018  
Revenue, Remaining Performance Obligation $ 1,792
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Product revenue | 2019  
Revenue, Remaining Performance Obligation $ 1,375
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years
License and royalty revenue | Remainder 2018  
Revenue, Remaining Performance Obligation $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
License and royalty revenue | 2019  
Revenue, Remaining Performance Obligation $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years
Contract Revenue | Remainder 2018  
Revenue, Remaining Performance Obligation $ 1,617
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Contract Revenue | 2019  
Revenue, Remaining Performance Obligation $ 2,553
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years