Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Employee Benefit Plans - Expense (Details) - USD ($)	12 Months Ended
Employee Benefit Plans - Expense (Details) - USD ($)	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Stock-Based Compensation
Total stock-based compensation expense	$ 976,000	$ 659,000	$ 398,000
Stock options
Stock-Based Compensation
Unrecognized compensation expense	$ 2,800,000
Weighted average period over which compensation expense is expected to be recognized	2 years 9 months 18 days
Restricted stock units
Stock-Based Compensation
Unrecognized compensation expense	$ 700,000
Weighted average period over which compensation expense is expected to be recognized	1 year 9 months 18 days
Cost of revenues
Stock-Based Compensation
Total stock-based compensation expense	$ 51,000	42,000	21,000
Selling, general and administrative expense
Stock-Based Compensation
Total stock-based compensation expense	858,000	567,000	315,000
Research and development expense
Stock-Based Compensation
Total stock-based compensation expense	$ 67,000	$ 50,000	$ 62,000