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3. Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Derivative Liability    
Beginning balance $ 9,165 $ 0
Initial measurement of derivative liability   28,480
Remeasurement adjustments - gains included in earnings (6,744) (19,315)
Ending balance 2,421 9,165
Contingent Consideration    
Beginning balance 14,055 0
Initial measurement of contingent consideration 0 14,193
Remeasurement adjustments - gains included in earnings (8,958) (138)
Ending balance $ 5,097 $ 14,055