Annual report pursuant to Section 13 and 15(d)

Geographic Location Information - Schedule of Revenues, Total Assets and Long-lived Assets by Geographic Location (Details)

v3.7.0.1
Geographic Location Information - Schedule of Revenues, Total Assets and Long-lived Assets by Geographic Location (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues by geographic location $ 17,402 $ 25,182
Total assets 4,765 5,751
Long lived assets 1,490 1,407
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues by geographic location 11,864 19,713
Total assets 4,760 5,743
Long lived assets 1,490 1,407
Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues by geographic location 4,143 4,405
Total assets 5 8
Long lived assets 0 0
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues by geographic location [1] 1,395 1,064
Total assets [1] 0 0
Long lived assets [1] $ 0 $ 0
[1] Principally Asia Pacific Region