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Fair Value Measurements and Marketable Securities - Additional Information (Detail) (USD $)
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3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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| Schedule Of Available For Sale Securities [Line Items] | ||
| Realized gain or losses | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |
| Weighted average maturity for available for sale securities | 4 months 27 days | |
| February 2015 and March 2011 Offering | ||
| Schedule Of Available For Sale Securities [Line Items] | ||
| Shares of common stock to be purchased with warrants |
12,100,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = thld_FebruaryTwoThousandFifteenAndMarchTwoThousandElevenOfferingMember |
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| Maximum | ||
| Schedule Of Available For Sale Securities [Line Items] | ||
| Available for sale securities, longest maturity date | 2016-05 | |
| X | ||||||||||
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- Definition
Available for sale securities, longest maturity date. No definition available.
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| X | ||||||||||
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- Definition
Weighted average maturity for available for sale securities. No definition available.
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| X | ||||||||||
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- Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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