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Stock-based Compenstaion Stock Options Outstanding And Exercisable (Details) - USD ($)	6 Months Ended
	Sep. 30, 2016	Mar. 31, 2016
Options Outstanding, Number of Shares	4,783,628	4,793,266
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 7.11	$ 6.29
Options Exercisable, Number of Shares	3,085,831
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 5.80
$0.55 - $4.26
Range of Exercise Prices, Minimum	0.55
Range of Exercise Prices, Maximum	$ 4.26
Options Outstanding, Number of Shares	995,488
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 1.44
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 324 days
Options Outstanding, Aggregate Intrinsic Value	$ 13,930,587
Options Exercisable, Number of Shares	995,448
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 1.4
Options Exercisable, Aggregate Intrinsic Value	$ 13,930,587
$4.32 - $6.86
Range of Exercise Prices, Minimum	$ 4.32
Range of Exercise Prices, Maximum	$ 6.86
Options Outstanding, Number of Shares	1,288,863
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 6.26
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years
Options Outstanding, Aggregate Intrinsic Value	$ 11,825,206
Options Exercisable, Number of Shares	925,675
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 6.02
Options Exercisable, Aggregate Intrinsic Value	$ 8,712,685
$7.52 - $8.93
Range of Exercise Prices, Minimum	$ 7.52
Range of Exercise Prices, Maximum	$ 8.93
Options Outstanding, Number of Shares	973,650
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 8.28
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	8 years 101 days
Options Outstanding, Aggregate Intrinsic Value	$ 6,963,536
Options Exercisable, Number of Shares	333,871
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 8.23
Options Exercisable, Aggregate Intrinsic Value	$ 2,403,471
$9.21 - $9.74
Range of Exercise Prices, Minimum	$ 9.21
Range of Exercise Prices, Maximum	$ 9.74
Options Outstanding, Number of Shares	983,835
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 9.62
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years
Options Outstanding, Aggregate Intrinsic Value	$ 5,711,928
Options Exercisable, Number of Shares	729,275
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 9.63
Options Exercisable, Aggregate Intrinsic Value	$ 4,232,016
$10.50 - $15.18
Range of Exercise Prices, Minimum	$ 10.50
Range of Exercise Prices, Maximum	$ 15.18
Options Outstanding, Number of Shares	541,832
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 12.92
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	9 years 36 days
Options Outstanding, Aggregate Intrinsic Value	$ 1,361,380
Options Exercisable, Number of Shares	101,562
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 11.10
Options Exercisable, Aggregate Intrinsic Value	$ 439,646
$0.55 - $15.18
Range of Exercise Prices, Minimum	$ 0.55
Range of Exercise Prices, Maximum	$ 15.18
Options Outstanding, Number of Shares	4,783,628
Options Outstanding, Aggregate Intrinsic Value	$ 39,792,637
Options Exercisable, Number of Shares	3,085,831
Options Exercisable, Aggregate Intrinsic Value	$ 29,718,405

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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