STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details) - $ / shares	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
STOCK-BASED COMPENSATION
Number of stock options outstanding, Beginning of period	19,170	5,723
Number of stock options outstanding, Expired	(280)	(112)
Number of stock options outstanding, End of period	18,890	5,611
Number of stock options Exercisable, End of period	18,890	1,828
Weighted average exercise price, Beginning of period	$ 79.78	$ 276.50
Weighted average exercise price, Expired	179.68	624.00
Weighted average exercise price, End of period	78.21	269.50
Weighted average exercise price Exercisable, End of period	$ 78.21	$ 682.50

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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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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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

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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