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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Grid
Disaggregation of Revenue [Line Items]
Revenue	$ 7,569	$ 16,498
Grid | Americas
Disaggregation of Revenue [Line Items]
Revenue	5,052	12,548
Grid | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	2,308	3,115
Grid | EMEA
Disaggregation of Revenue [Line Items]
Revenue	209	835
Grid | Equipment and systems
Disaggregation of Revenue [Line Items]
Revenue	5,503	12,957
Grid | Services and technology development
Disaggregation of Revenue [Line Items]
Revenue	2,066	3,541
Wind
Disaggregation of Revenue [Line Items]
Revenue	7,307	10,985
Wind | Americas
Disaggregation of Revenue [Line Items]
Revenue	24	47
Wind | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	7,278	10,873
Wind | EMEA
Disaggregation of Revenue [Line Items]
Revenue	5	65
Wind | Equipment and systems
Disaggregation of Revenue [Line Items]
Revenue	7,219	10,711
Wind | Services and technology development
Disaggregation of Revenue [Line Items]
Revenue	$ 88	$ 274

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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