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8. STOCK- BASED COMPENSATION - Options outstanding by exercise price (Details) - $ / shares | 3 Months Ended |
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Jun. 30, 2017 | Mar. 31, 2017
Options outstanding by exercise price |  |
Exercise Price (in dollars per share) | $ 5.14 | $ 5.09
Number of Shares Underlying Options Outstanding (in shares) | 7,331,824 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 5.14 |
Options Outstanding, Weighted Average Remaining Contractual Life | 5 years 7 months 24 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 4,753,789 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 5.16 |
$2.43 - $3.40 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 2.43 |
Exercise Price, high end of range (in dollars per share) | $ 3.40 |
Number of Shares Underlying Options Outstanding (in shares) | 757,620 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 3.24 |
Options Outstanding, Weighted Average Remaining Contractual Life | 4 years 2 months 12 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 530,887 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 3.17 |
$3.43 - $4.00 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 3.43 |
Exercise Price, high end of range (in dollars per share) | $ 4.00 |
Number of Shares Underlying Options Outstanding (in shares) | 1,064,296 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 3.81 |
Options Outstanding, Weighted Average Remaining Contractual Life | 2 years 11 months 5 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 946,702 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 3.83 |
$4.17 - $4.90 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 4.17 |
Exercise Price, high end of range (in dollars per share) | $ 4.90 |
Number of Shares Underlying Options Outstanding (in shares) | 905,287 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.53 |
Options Outstanding, Weighted Average Remaining Contractual Life | 5 years 26 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 817,862 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 4.54 |
$4.92 - $4.99 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 4.92 |
Exercise Price, high end of range (in dollars per share) | $ 4.99 |
Number of Shares Underlying Options Outstanding (in shares) | 1,211,981 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.98 |
Options Outstanding, Weighted Average Remaining Contractual Life | 8 years 3 months 29 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 205,454 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 4.96 |
$5.13 - $5.28 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 5.13 |
Exercise Price, high end of range (in dollars per share) | $ 5.28 |
Number of Shares Underlying Options Outstanding (in shares) | 776,973 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 5.24 |
Options Outstanding, Weighted Average Remaining Contractual Life | 7 years 9 months 11 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 108,258 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 5.20 |
$5.34 - $6.00 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 5.34 |
Exercise Price, high end of range (in dollars per share) | $ 6.00 |
Number of Shares Underlying Options Outstanding (in shares) | 761,081 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 5.75 |
Options Outstanding, Weighted Average Remaining Contractual Life | 5 years 1 month 21 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 718,483 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 5.77 |
$6.16 - $6.54 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 6.16 |
Exercise Price, high end of range (in dollars per share) | $ 6.54 |
Number of Shares Underlying Options Outstanding (in shares) | 866,963 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 6.35 |
Options Outstanding, Weighted Average Remaining Contractual Life | 6 years 26 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 570,653 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 6.43 |
$6.61 - $7.00 |  |
Options outstanding by exercise price |  |
Exercise Price, low end of range (in dollars per share) | 6.61 |
Exercise Price, high end of range (in dollars per share) | $ 7.00 |
Number of Shares Underlying Options Outstanding (in shares) | 787,253 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 6.82 |
Options Outstanding, Weighted Average Remaining Contractual Life | 5 years 1 month 2 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 742,110 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 6.84 |
$7.40 |  |
Options outstanding by exercise price |  |
Exercise Price (in dollars per share) | $ 7.40 |
Number of Shares Underlying Options Outstanding (in shares) | 86,990 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 7.40 |
Options Outstanding, Weighted Average Remaining Contractual Life | 9 years 10 months 6 days |
$9.20 |  |
Options outstanding by exercise price |  |
Exercise Price (in dollars per share) | $ 9.20 |
Number of Shares Underlying Options Outstanding (in shares) | 113,380 |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 9.20 |
Options Outstanding, Weighted Average Remaining Contractual Life | 3 years 5 months 9 days |
Options Exercisable, Number Vested and Exercisable (in shares) | 113,380 |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 9.20 |

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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 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. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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