| 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 Noncurrent portion of the fair value as of the acquisition date of potential payments under the contingent consideration arrangement, including cash and shares as applicable. No definition available. 
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
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