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NONVESTED SHARES - Summary of Nonvested Shares Granted and Vested (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted average grant date fair value |  |  |  |  |  |  |
Incremental compensation expenses | $ 2,060 | $ 405 | $ 1,865 |  |  |  |
2008 Plan | Nonvested shares |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 548,780 |  |  |  |  |  |
Granted (in shares) | 1,829,000 | 244,000 | 272,000 | 296,000 | 3,154,800 | 2,800,300 | 711,571
Forfeited (in shares) | (104,476) |  |  |  |  |  |
Vested (in shares) | (1,813,304) |  |  |  |  |  |
Outstanding at the end of the period (in shares) | 460,000 | 548,780 |  |  |  |  |
Weighted average grant date fair value |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 5.07 |  |  |  |  |  |
Granted (in dollars per share) | 0.54 |  |  |  |  |  |
Forfeited (in dollars per share) | 1.52 |  |  |  |  |  |
Vested (in dollars per share) | 0.54 |  |  |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 5.74 | $ 5.07 |  |  |  |  |
Fair value of shares vested | $ 972 | $ 379 | $ 808 |  |  |  |
Incremental compensation expenses | 1,995 | $ 384 | $ 1,768 |  |  |  |
Unrecognized compensation cost | $ 327 |  |  |  |  |  |
Weighted-average period of recognition of unrecognized compensation cost | 1 year 9 months 26 days |  |  |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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