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7. STOCK- BASED COMPENSATION (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Stock-Based Compensation |  |  |  |
Shares available for grant, Beginning |  |  | 5,585,500 |
Options reserved (in shares) |  |  | 1,377,699 |
Granted (in shares) |  |  | (575,043) |
Forfeited (in shares) |  |  | 8,200 |
Shares available for grant, Ending | 6,396,356 |  | 6,396,356 |
Number of Shares Underlying Options Outstanding |  |  |  |
Balance at the beginning of the period (in shares) |  |  | 6,143,980 |
Granted (in shares) |  |  | 575,043 |
Exercised (in shares) |  |  | (105,725) |
Forfeited (in shares) |  |  | (8,200) |
Balance at the end of the period (in shares) | 6,605,098 |  | 6,605,098 |
Options vested and exercisable (in shares) | 4,188,255 |  | 4,188,255 |
Options vested and expected to vest (in shares) | 6,556,577 |  | 6,556,577 |
Weighted Average Remaining Contractual Life |  |  |  |
Options vested and exercisable (in dollars per share) | 4 years 5 months 12 days |  |  |
Options vested and expected to vest (in dollars per share) | 5 years 10 months 13 days |  |  |
Weighted Average Exercise Price |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  | $ 5.13 |
Granted (in dollars per share) |  |  | $ 5.29 |
Exercised (in dollars per share) |  |  | $ 4.04 |
Forfeited (in dollars per share) |  |  | $ 5.97 |
Balance at the end of the period (in dollars per share) | $ 5.16 |  | $ 5.16 |
Options vested and exercisable (in dollars per share) | $ 4.83 |  | $ 4.83 |
Options vested and expected to vest (in dollars per share) | $ 5.16 |  | $ 5.16 |
Intrinsic Value |  |  |  |
Exercised (in dollars) |  |  | $ 224,178 |
Options vested and exercisable (in dollars) | 3,742,830 |  | 3,742,830 |
Options vested and expected to vest (in dollars) | $ 4,300,040 |  | $ 4,300,040 |
Weighted average fair value |  |  |  |
Weighted average fair value per underlying share of options granted (in dollars per share) | $ 2.14 | $ 2.93 | $ 2.16 | $ 2.72

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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