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Income Taxes
 6 Months Ended
Sep. 30, 2012
Income Taxes [Abstract]  
Income Taxes

9. Income Taxes

For the three and six months ended September 30, 2012, the Company recorded income tax expense of $0.1 million and an income tax benefit of $0.8 million, respectively. For the three and six months ended September 30, 2011, the Company recorded income tax expense of $0.9 million and $1.1 million, respectively. The income tax expense for the three months ended September 30, 2012, was primarily due to income taxes in foreign jurisdictions. The income tax benefit for the six months ended September 30, 2012 was primarily due to a refund of income taxes paid in China. The Company has provided a valuation allowance against all existing and newly created deferred tax assets as of September 30, 2012, as it is more likely than not that its deferred tax assets are not currently realizable due to the net operating losses incurred by the Company since its inception.