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Revenue Recognition (Tables)
 3 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Cumulative effect of ASU 2014-09
The cumulative effect to the Company’s consolidated April 1, 2018 balance sheet from the adoption of the new revenue standard and the sale of nonfinancial assets was as follows (in thousands):
 
March 31,
2018
 
Opening Adjustment
 
April 1,
2018
Assets:
 
 
 
 
 
Inventory
$
19,780

 
$
(1,599
)
 
$
18,181

Prepaid expenses and other current assets
2,947

 
1,599

 
4,546

Notes receivable, long term portion
2,559

 
105

 
2,664

 
 
 
 
 
 
Liabilities and Stockholders' Equity:
 
 
 
 
 
Accounts payable and accrued expenses
$
(12,625
)
 
$
(2,729
)
 
$
(15,354
)
Deferred revenue
(13,483
)
 
2,657

 
(10,826
)
 
 
 
 
 
 
Accumulated deficit
$
(988,333
)
 
$
(33
)
 
$
(988,366
)
Disaggregation of Revenue
The following tables disaggregate the Company’s revenue by product line and by shipment destination:
 
Three months ended
June 30, 2018
Product Line:
Grid
 
Wind
Equipment and systems
$
7,462

 
$
3,492

Services and technology development
1,467

 
186

     Total
$
8,929

 
$
3,678

 
 
 
 
Region:
 
 
 
Americas
$
7,496

 
$
23

Asia Pacific
808

 
3,595

EMEA
625

 
60

     Total
$
8,929

 
$
3,678
Contract with Customer
Changes in the Company’s contract assets, which are included in “Unbilled AR” and "Deferred program costs" (see Note 7, “Accounts Receivable” and Note 8, "Inventory" for a reconciliation to the condensed consolidated balance sheet) and contract liabilities, which are included in the current portion and long term portion of “deferred revenue” in the Company’s condensed consolidated balance sheets, are as follows:
 
Unbilled AR
 
Deferred Program Costs
 
Contract Liabilities
Beginning balance as of March 31, 2018
$
3,016

 
$
2,567

 
$
21,937

Impact of adoption of ASC 606
—

 
(1,599
)
 
(2,657
)
Increases for costs incurred to fulfill performance obligations
—

 
1,132

 
—

Increase (decrease) due to customer billings
(3,221
)
 
—

 
4,281

Decrease due to cost recognition on completed performance obligations
—

 
(48
)
 
—

Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations
4,824

 
(9
)
 
(3,324
)
Other changes and FX impact
(16
)
 
34

 
(764
)
Ending balance as of June 30, 2018
$
4,603

 
$
2,077

 
$
19,473
Schedule of Revenues by Major Customers
The following table sets forth customers who represented 10% or more of the Company’s total revenues for the three months ended June 30, 2018 and 2017:
 
Reportable Segment
 
June 30, 2018
 
June 30, 2017
Inox Wind Limited
Wind
 
25
%
 
22
%
Vestas
Grid
 
36
%
 
—
%
U.S. Navy
Grid
 
<10%

 
35
%