| Commitments and Contingencies - Additional Information (Detail) In Thousands, unless otherwise specified | 6 Months Ended | |||
|---|---|---|---|---|
| Sep. 30, 2012
 USD ($) | Sep. 30, 2011
 USD ($) | May 04, 2012
 GBP (£) | Mar. 06, 2012
 USD ($) | |
| Loss Contingencies [Line Items] | ||||
| Future minimum payments under initial terms of leases | $ 57 | |||
| Rental expense for continuing operations | 152 | 92 | ||
| Dispute settlement amount | £ 23 | $ 73 | ||
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- Details 
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| X | ||||||||||
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- Definition Amount of consideration the entity has agreed to pay to settle a legal matter. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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