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Other Income, Net of Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Other Income, Net of Expenses [Abstract]    
Interest income $ 175 $ 288
Gain (loss) on investments 27 (36)
License fee income 250 195
Other 60 97
Total $ 512 $ 544