Accumulated Other Comprehensive Loss

The following tables provide a reconciliation of the components of accumulated other comprehensive loss, net of tax, attributable to The Medicines Company for the three and nine months ended September 30, 2018 and 2017:



	Three Months Ended September 30,
	2018								2017
	Foreign currency translation adjustment			Unrealized loss on available for sale securities		Total			Foreign currency translation adjustment			Unrealized loss on available for sale securities			Total
	(in thousands)
Balance at beginning of period	$	(4,594	)	$	—	$	(4,594	)	$	(5,439	)	$	(7	)	$	(5,446	)
Other comprehensive (loss) income	(11		)	—		(11		)	487			10			497
Total other comprehensive (loss) income	(11		)	—		(11		)	487			10			497
Balance at end of period	$	(4,605	)	$	—	$	(4,605	)	$	(4,952	)	$	3		$	(4,949	)



	Nine Months Ended September 30,
	2018								2017
	Foreign currency translation adjustment			Unrealized loss on available for sale securities		Total			Foreign currency translation adjustment			Unrealized loss on available for sale securities		Total
	(in thousands)
Balance at beginning of period	$	(5,183	)	$	—	$	(5,183	)	$	(5,479	)	$	—	$	(5,479	)
Other comprehensive (loss) income before reclassifications	(605		)	—		(605		)	527			3		530
Amounts reclassified from accumulated other comprehensive loss⁽¹⁾	1,183			—		1,183			—			—		—
Total other comprehensive income (loss)	578			—		578			527			3		530
Balance at end of period	$	(4,605	)	$	—	$	(4,605	)	$	(4,952	)	$	3	$	(4,949	)

(1) See Note 15, “Discontinued Operations,” for a discussion of this reclassification of foreign currency translation adjustment.