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Business Segments - Geographic Information about Revenue, Based on Shipments to Customers by Region (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 96,023	$ 70,530	$ 84,117
India
Segment Reporting Information [Line Items]
Revenues									59,640	39,314	26,384
U.S
Segment Reporting Information [Line Items]
Revenues									14,565	9,820	11,013
China
Segment Reporting Information [Line Items]
Revenues									8,455	10,410	24,748
Asia Pacific
Segment Reporting Information [Line Items]
Revenues									5,364	3,788	8,223
Africa
Segment Reporting Information [Line Items]
Revenues									2,697	616	2,187
Australia
Segment Reporting Information [Line Items]
Revenues									2,410	1,653	3,037
Europe
Segment Reporting Information [Line Items]
Revenues									1,775	2,239	5,213
Canada
Segment Reporting Information [Line Items]
Revenues									$ 1,117	$ 2,690	$ 3,312

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

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+ References

No definition available.

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