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SHARE-BASED COMPENSATION (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
2007 EIP |  |
SHARE-BASED COMPENSATION |  |
Number of shares of common stock reserved for grants | 691,051 |
Common stock issued under share-based compensation plan | 253,659 |
2012 EIP |  |
SHARE-BASED COMPENSATION |  |
Number of shares of common stock reserved for grants | 1,200,000 |
Common stock issued under share-based compensation plan | 635,089 |
2015 EIP |  |
SHARE-BASED COMPENSATION |  |
Number of shares of common stock reserved for grants | 1,100,000 |
Common stock issued under share-based compensation plan | 343,429 |
Stock Options |  |
SHARE-BASED COMPENSATION |  |
Expiration term | 10 years |
Summary of the stock option activity |  |
Outstanding at the beginning of the period (in shares) | 67,188 |
Granted (in shares) | 0 |
Expired (in shares) | (10,326) |
Outstanding at the end of the period (in shares) | 56,862 | 67,188
Exercisable (in shares) | 56,862 |
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 24.65 |
Expired (in dollars per share) | 77.47 |
Outstanding at the end of the period (in dollars per share) | 15.06 | $ 24.65
Exercisable (in dollars per share) | $ 15.06 |
Weighted Average Remaining Contractual Term |  |
Outstanding at the end of the period | 2 years 8 months 19 days | 3 years 4 months 21 days
Exercisable | 2 years 8 months 19 days |
Stock Options | 2007 EIP |  |
SHARE-BASED COMPENSATION |  |
Number of shares reserved | 22,733 |
Stock Options | 2012 EIP |  |
SHARE-BASED COMPENSATION |  |
Number of shares reserved | 34,129 |
Stock Options | Minimum |  |
SHARE-BASED COMPENSATION |  |
Vesting term | 1 year |
Stock Options | Maximum |  |
SHARE-BASED COMPENSATION |  |
Vesting term | 5 years |
RSU |  |
Summary of the stock option activity |  |
Outstanding at the beginning of the period (in shares) | 512,142 |
Outstanding at the end of the period (in shares) |  | 512,142
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 4.57 |
Outstanding at the end of the period (in dollars per share) |  | $ 4.57
RSU | 2007 EIP |  |
SHARE-BASED COMPENSATION |  |
Number of shares reserved | 0 |
RSU | 2015 EIP |  |
SHARE-BASED COMPENSATION |  |
Number of shares reserved | 805,844 |
RSU | Minimum |  |
SHARE-BASED COMPENSATION |  |
Vesting term | 1 year |
RSU | Maximum |  |
SHARE-BASED COMPENSATION |  |
Vesting term | 5 years |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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