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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
	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	$ 25,129us-gaap_SalesRevenueNet	$ 21,250us-gaap_SalesRevenueNet	$ 12,455us-gaap_SalesRevenueNet	$ 11,696us-gaap_SalesRevenueNet	$ 16,287us-gaap_SalesRevenueNet	$ 20,563us-gaap_SalesRevenueNet	$ 24,181us-gaap_SalesRevenueNet	$ 23,086us-gaap_SalesRevenueNet	$ 70,530us-gaap_SalesRevenueNet	$ 84,117us-gaap_SalesRevenueNet	$ 87,419us-gaap_SalesRevenueNet
U.S
Segment Reporting Information [Line Items]
Revenues									9,820us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	11,013us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	13,197us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Canada
Segment Reporting Information [Line Items]
Revenues									2,690us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	3,312us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	1,663us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
Europe
Segment Reporting Information [Line Items]
Revenues									2,905us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	7,453us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	14,709us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
China
Segment Reporting Information [Line Items]
Revenues									10,410us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	24,748us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	17,906us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
Korea
Segment Reporting Information [Line Items]
Revenues									3,506us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	6,429us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	10,945us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
India
Segment Reporting Information [Line Items]
Revenues									39,314us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN	26,384us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN	17,062us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN
Australia
Segment Reporting Information [Line Items]
Revenues									$ 1,885us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU	$ 4,779us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU	$ 11,937us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU

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



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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