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Supplemental Financial Information - Supplemental Income Statement, Other (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]        
Gain on sale of equity method investment $ 0 $ 0 $ 0 $ 2,078
Gain on settlement of note payable and licensed technology 0 151 0 1,019
Other 7 (430) 16 (417)
Other nonoperating income (expense) $ 7 $ (279) $ 16 $ 2,680