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Financial Instruments - Financial Assets Recorded at FVTOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financial instruments [Abstract]    
Unrealized net gains on short-term investments, other than equity securities $ 993 $ 810
Reclassification adjustment for realized (gains) losses on short-term investments, other than equity securities (788) 361
Unrealized gains (losses) on financial assets recorded at fair value through other comprehensive income $ 205 $ 1,171