Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Schedule of 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, 2017 and 2016:

	Three Months Ended September 30,
	2017									2016
	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	$	(5,439	)	$	(7	)	$	(5,446	)	$	(5,414	)	$	—	$	(5,414	)
Other comprehensive loss before reclassifications	487			10			497			(70		)	—		(70		)
Total other comprehensive loss	487			10			497			(70		)	—		(70		)
Balance at end of period	$	(4,952	)	$	3		$	(4,949	)	$	(5,484	)	$	—	$	(5,484	)

	Nine Months Ended September 30,
	2017								2016
	Foreign currency translation adjustment			Unrealized loss on available for sale securities		Total			Foreign currency translation adjustment			Unrealized gain (loss) on available for sale securities			Total
	(in thousands)
Balance at beginning of period	$	(5,479	)	$	—	$	(5,479	)	$	3,924		$	49		$	3,973
Other comprehensive income before reclassifications	527			3		530			208			—			208
Amounts reclassified from accumulated other comprehensive income(1) (2)	—			—		—			(9,616		)	(49		)	(9,665		)
Total other comprehensive (loss) income	527			3		530			(9,408		)	(49		)	(9,457		)
Balance at end of period	$	(4,952	)	$	3	$	(4,949	)	$	(5,484	)	$	—		$	(5,484	)

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(1) Amounts were reclassified to other income in the accompanying condensed consolidated statements of operations. There is generally no tax impact related to foreign currency translation adjustments, as earnings are considered permanently reinvested. In addition, there were no material tax impacts related to unrealized gains or losses on available for sale securities in the periods presented.

(2) See Note 16, “Discontinued Operations,” for a discussion of this reclass of foreign currency translation adjustment.