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Segment Information (Tables)
 6 Months Ended
Oct. 31, 2017
Segment Reporting [Abstract]  
Summary of Segment Activity
The following tables summarize, for the periods indicated, operating results by reportable segment (table in thousands):
Three months ended October 31, 2017
 
Personalized
Oncology
Solutions
(POS)
 
Translational
Oncology
Solutions
(TOS)
 
Unallocated
Corporate
Overhead
 
Consolidated
Net revenue
 
$
378

 
$
4,825

 
$
—

 
$
5,203

Direct cost of services
 
(259
)
 
(2,392
)
 
—

 
(2,651
)
Sales and marketing costs
 
(85
)
 
(459
)
 
—

 
(544
)
Other operating expenses
 
—

 
(1,073
)
 
(857
)
 
(1,930
)
Stock- based compensation expense (1)
 
—

 
—

 
(148
)
 
(148
)
 
 
 
 
 
 
 
 
 
Segment profit (loss)
 
$
34

 
$
901

 
$
(1,005
)
 
$
(70
)
 
Three months ended October 31, 2016
 
Personalized
Oncology
Solutions
(POS)
 
Translational
Oncology
Solutions
(TOS)
 
Unallocated
Corporate
Overhead
 
Consolidated
Net revenue
 
$
497

 
$
3,960

 
$
—

 
$
4,457

Direct cost of services
 
(374
)
 
(1,826
)
 
—

 
(2,200
)
Sales and marketing costs
 
(128
)
 
(571
)
 
—

 
(699
)
Other operating expenses
 
—

 
(964
)
 
(552
)
 
(1,516
)
Stock- based compensation expense (1)
 
—

 
—

 
(535
)
 
(535
)
 
 
 
 
 
 
 
 
 
Segment profit (loss)
 
$
(5
)
 
$
599

 
$
(1,087
)
 
$
(493
)
 
Six Months Ended October 31, 2017
 
Personalized
Oncology
Solutions
(POS)
 
Translational
Oncology
Solutions
(TOS)
 
Unallocated
Corporate
Overhead
 
Consolidated
Net revenue
 
$
818

 
$
9,419

 
$
—

 
$
10,237

Direct cost of services
 
(645
)
 
(4,620
)
 
—

 
(5,265
)
Sales and marketing costs
 
(171
)
 
(1,023
)
 
—

 
(1,194
)
Other operating expenses
 
—

 
(2,111
)
 
(1,645
)
 
(3,756
)
Stock- based compensation expense (1)
 
—

 
—

 
(711
)
 
(711
)
 
 
 
 
 
 
 
 
 
Segment profit (loss)
 
$
2

 
$
1,665

 
$
(2,356
)
 
$
(689
)

Six Months Ended October 31, 2016
 
Personalized
Oncology
Solutions
(POS)
 
Translational
Oncology
Solutions
(TOS)
 
Unallocated
Corporate
Overhead
 
Consolidated
Net revenue
 
$
1,007

 
$
7,119

 
$
—

 
$
8,126

Direct cost of services
 
(845
)
 
(3,832
)
 
—

 
(4,677
)
Sales and marketing costs
 
(269
)
 
(1,187
)
 
—

 
(1,456
)
Other operating expenses
 
—

 
(2,090
)
 
(1,256
)
 
(3,346
)
Stock- based compensation expense (1)
 
—

 
—

 
(1,664
)
 
(1,664
)
 
 
 
 
 
 
 
 
 
Segment profit (loss)
 
$
(107
)
 
$
10

 
$
(2,920
)
 
$
(3,017
)

(1) Stock compensation expense is shown separately and is excluded from direct costs of services, sales and marketing costs, and other operating expenses, as it is managed on a consolidated basis and is not used by management to evaluate the performance of its segments. See Note 3 for the allocation of stock compensation expense relative to the individual line items as it is reported on the Company's Consolidated Statements of Operations.