Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Derivative Financial Instruments [Abstract]

Gains (Losses) Related to Derivative Instruments Designated as Cash Flow Hedges

The following table summarizes gains (losses) related to derivative instruments recorded in other comprehensive income (loss) during the three- and nine-month periods ended September 30, 2019 and 2018 (U.S. dollars in thousands):

	Amount of Gain (Loss) Recognized in Other Comprehensive Loss
Derivatives Designated	Three Months Ended September 30,				Nine Months Ended September 30,
as Hedging Instruments:	2019		2018		2019		2018
Foreign currency forward contracts related to intercompany license fee, product sales, and selling expense hedges	$	—	$	—	$	—	$	(160	)

		Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income
Derivatives Designated	Location of Gain (Loss) Reclassified from Accumulated	Three Months Ended September 30,				Nine Months Ended September 30,
as Hedging Instruments:	Other Comprehensive Loss into Income	2019		2018		2019		2018
Foreign currency forward contracts related to intercompany license fees and product sales hedges	Revenue	$	—	$	—	$	—	$	18