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Business Segment and Geographic Information - Geographic Information about Revenue, Based on Shipments to Customers by Region (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 25,129 us-gaap_SalesRevenueNet | $ 21,250 us-gaap_SalesRevenueNet | $ 12,455 us-gaap_SalesRevenueNet | $ 11,696 us-gaap_SalesRevenueNet | $ 16,287 us-gaap_SalesRevenueNet | $ 20,563 us-gaap_SalesRevenueNet | $ 24,181 us-gaap_SalesRevenueNet | $ 23,086 us-gaap_SalesRevenueNet | $ 70,530 us-gaap_SalesRevenueNet | $ 84,117 us-gaap_SalesRevenueNet | $ 87,419 us-gaap_SalesRevenueNet
U.S |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 9,820 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 11,013 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 13,197 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,690 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA | 3,312 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA | 1,663 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,905 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 7,453 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 14,709 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
China |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 10,410 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 24,748 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 17,906 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
Korea |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,506 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 6,429 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 10,945 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
India |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 39,314 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN | 26,384 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN | 17,062 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN
Australia |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,885 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU | $ 4,779 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU | $ 11,937 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU

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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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