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Fair Value on Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | $ 53,569 |  | $ 10,268 |
Total financial liabilities | 10,976 |  | 5,903 |
Money Market Funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 53,569 | [1] | 10,268 | [1]
Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 10,976 |  | 5,903 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 53,569 |  | 10,268 |
Total financial liabilities |  |  | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 53,569 | [1] | 10,268 | [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities |  |  | 0 |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets |  |  | 0 |
Total financial liabilities |  |  | 0 |
Significant Other Observable Inputs (Level 2) | Money Market Funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets |  |  | 0 | [1]
Significant Other Observable Inputs (Level 2) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities |  |  | 0 |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets |  |  | 0 |
Total financial liabilities | 10,976 |  | 5,903 |
Significant Unobservable Inputs (Level 3) | Money Market Funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets |  |  | 0 | [1]
Significant Unobservable Inputs (Level 3) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | $ 10,976 |  | $ 5,903 |
[1] | Included in cash and cash equivalents on the Company's condensed consolidated balance sheets.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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