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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, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 13,498	$ 14,933	$ 11,049	$ 8,923	$ 16,195	$ 27,148	$ 18,507	$ 13,345	$ 48,403	$ 75,195	$ 96,023
India
Segment Reporting Information [Line Items]
Revenues									12,932	44,243	59,640
U.S.
Segment Reporting Information [Line Items]
Revenues									17,315	16,224	14,565
China
Segment Reporting Information [Line Items]
Revenues									679	2,004	8,455
Asia Pacific
Segment Reporting Information [Line Items]
Revenues									3,754	2,106	5,364
Africa
Segment Reporting Information [Line Items]
Revenues									118	1,548	2,697
Australia
Segment Reporting Information [Line Items]
Revenues									3,072	4,053	2,410
Europe
Segment Reporting Information [Line Items]
Revenues									5,405	3,624	1,775
Canada
Segment Reporting Information [Line Items]
Revenues									1,120	1,393	1,117
Middle East
Segment Reporting Information [Line Items]
Revenues									$ 4,008	$ 0	$ 0

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=63488584&loc=d3e20235-122688

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- Definition

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+ References

No definition available.

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