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Certain Balance Sheet Items - Deferred Revenue (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred revenue    
Total deferred revenue $ 5,259 $ 9,255
Contract with Customer, Liability, Current 4,012 4,247
Less current portion   4,247
Deferred revenue, net of current portion 1,247 5,008
License Fees And Event-Based [Member]    
Deferred revenue    
Contract with Customer, Liability 2,764 2,264
Product sales, net | Product sales, net    
Deferred revenue    
Contract with Customer, Liability $ 2,495 $ 6,991