Commitments and Contingencies (Details 2) (Special Long-Term Retention and Incentive Equity Awards Program, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2012 Stock-based compensation	Dec. 31, 2012 Cash bonus expense
Special Long-Term Retention and Incnetive Equity Awards Program
Timeframe for achievement of performance conditions	6 years
Compensation expenses to be recognized if sufficient performance conditions are achieved		$ 31.9	$ 38.2
Compensation expenses related to cash bonus to be recognized in next fiscal year if sufficient performance conditions are achieved		$ 15.6	$ 18.7

Aggregate potential maximum cost of compensation made to employees under long term retention progam that may be recognized in the next fiscal year.

No definition available.

Name:	thrx_LongTermRetentionProgramPotentialMaximumTotalCompensationCostInNextFiscalYear
Namespace Prefix:	thrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant