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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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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 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 + Details
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