Collaborative Arrangements (Details 2) (GSK, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
GSK
Collaborative Arrangements and Non-collaborative Arrangement Transactions
Reimbursement of certain research and development costs to the entity	$ 0.1	$ 0.5	$ 0.2

Represents the amount of research reimbursement recognized under the collaborative arrangement by the entity as a result of reduction in research and development expense.

No definition available.

Name:	thrx_CollaborativeArrangementResearchAndDevelopmentExpensesReimbursedToEntity
Namespace Prefix:	thrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration