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Other Income, Net of Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Income, Net of Expenses [Abstract]        
Interest income $ 156 $ 155 $ 331 $ 443
Gain (loss) on investments 14 22 41 (15)
License fee income 74 61 324 256
Other 17 38 77 135
Total $ 261 $ 276 $ 773 $ 819