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Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Provision for Income Taxes, Current, Federal $ 0 $ 0
Provision for Income Taxes, Current, State 3 5
Provision for Income Taxes, Current, Foriegn 124 12
Provision for Income Taxes, Current, Total 127 17
Provision for Income Taxes, Deferred, Federal (25,948) (2,015)
Provision for Income Taxes, Deferred, State (1,771) (148)
Provision for Income Taxes, Deferred, Foreign 8 0
Provision for Income Taxes, Deferred, Total (27,711) (2,163)
Provision for Income Taxes, Change in valuation allowance, Federal 25,948 2,015
Provision for Income Taxes, Change in valuation allowance, State 1,771 148
Provision for Income Taxes, Change in valuation allowance, Foreign (8) 0
Provision for Income Taxes, Change in valuation allowance, Total 27,711 2,163
Provision for Income Taxes, Total, Federal 0 0
Provision for Income Taxes, Total, State 3 5
Provision for Income Taxes, Total, Foreign 124 12
Provision for Income Taxes, Total $ 127 $ 17