Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Mar. 31, 2012
Basis of Presentation            
Loss from operations $ (3,705) $ (6,235) $ (10,285) $ (13,718)    
Cash and cash equivalents $ 28,267 $ 45,217 $ 28,267 $ 45,217 $ 38,817 $ 49,952
Minimum period for which cash and cash equivalents are believed to be sufficient to meet the entity's cash needs     12 months