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Other Financial Information (Accrued Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Employee benefits and compensation $ 11,255 $ 8,597
Research and development accruals 13,814 9,826
Other accrued expenses 1,665 974
Accrued expenses $ 26,734 $ 19,397