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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2018
Grid
Disaggregation of Revenue [Line Items]
Revenue	$ 6,826	$ 23,325
Grid | Americas
Disaggregation of Revenue [Line Items]
Revenue	3,771	16,319
Grid | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	2,815	5,930
Grid | EMEA
Disaggregation of Revenue [Line Items]
Revenue	240	1,076
Grid | Equipment and systems
Disaggregation of Revenue [Line Items]
Revenue	4,614	17,571
Grid | Services and technology development
Disaggregation of Revenue [Line Items]
Revenue	2,212	5,754
Wind
Disaggregation of Revenue [Line Items]
Revenue	7,308	18,293
Wind | Americas
Disaggregation of Revenue [Line Items]
Revenue	36	82
Wind | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	7,263	18,136
Wind | EMEA
Disaggregation of Revenue [Line Items]
Revenue	9	75
Wind | Equipment and systems
Disaggregation of Revenue [Line Items]
Revenue	7,215	17,925
Wind | Services and technology development
Disaggregation of Revenue [Line Items]
Revenue	$ 93	$ 368

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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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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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