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

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

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

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

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Stock-Based Compensation - Expense (Details) - USD ($)	3 Months Ended		6 Months Ended
Stock-Based Compensation - Expense (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock-Based Compensation
Total stock-based compensation expense	$ 428,000	$ 262,000	$ 877,000	$ 486,000
Stock options
Stock-Based Compensation
Unrecognized compensation expense related to unvested stock options	3,000,000		$ 3,000,000
Weighted average period over which compensation expense is expected to be recognized			2 years 7 months 6 days
Restricted stock units
Stock-Based Compensation
Unrecognized compensation expense related to unvested RSUs	574,000		$ 574,000
Weighted average period over which compensation expense is expected to be recognized			1 year 6 months
Cost of revenues
Stock-Based Compensation
Total stock-based compensation expense	16,000	12,000	$ 31,000	22,000
Selling, general and administrative expense
Stock-Based Compensation
Total stock-based compensation expense	376,000	233,000	768,000	433,000
Research and development expense
Stock-Based Compensation
Total stock-based compensation expense	$ 36,000	$ 17,000	$ 78,000	$ 31,000