SUBSEQUENT EVENT (Details) (Subsequent events, Common stock, Future Sale of Stock, GSK, USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
Oct. 29, 2013
Subsequent events \| Common stock \| Future Sale of Stock \| GSK
Subsequent events
Agreement to issue stock, number of shares	130,473
Agreement to issue stock in private placement, price per shares (in dollars per share)	$ 37.66
Agreement to issue stock in private placement, aggregate purchase price	$ 4.9

Number of shares that will be issued to the related party under the common stock purchase agreement.

No definition available.

Name:	thrx_FutureIssuanceOfSharesUnderCommonStockPurchaseAgreementWithRelatedParty
Namespace Prefix:	thrx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration