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Fair Value Measurements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended |  |
--- | --- | --- | ---
May 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Contingent liability |  | $ 841 |
Contingent Liabilities |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Contingent liability |  | 841 |
Warrant |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Fair value of derivative liability | $ 473 | $ 0 | $ 452
Expected life | 5 years |  |
Risk free interest rate | 40.00% |  |
Dividend yield | 0.00% |  |
Volatility | 170.00% |  |

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- Definition Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 10 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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