Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS
Amortization of capitalized fees paid to a related party	$ 11,066	$ 743	$ 0

Represents the amortization of capitalized fees paid to a related party.

No definition available.

Name:	thrx_AmortizationOfCapitalizedFeesPaidToRelatedParty
Namespace Prefix:	thrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration