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FAIR VALUE MEASUREMENTS (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Total
Fair value measurements
Total assets measured at fair value		$ 76,640,000
Certificate of deposit | Total
Fair value measurements
Certificates of deposit		377,000
Money market funds | Total
Fair value measurements
Money market funds		76,263,000
Level 1
Fair value measurements
Total assets measured at fair value		76,263,000
Level 1 | Money market funds
Fair value measurements
Money market funds		76,263,000
Level 2
Fair value measurements
Total assets measured at fair value		377,000
Long-term debt, fair value	$ 31,324	32,859
Level 2 | Certificate of deposit
Fair value measurements
Certificates of deposit		$ 377,000
Recurring basis | Total
Fair value measurements
Total assets measured at fair value	34,734,000
Recurring basis | Certificate of deposit | Total
Fair value measurements
Certificates of deposit	377,000
Recurring basis | Money market funds | Total
Fair value measurements
Money market funds	34,357,000
Recurring basis | Level 1
Fair value measurements
Total assets measured at fair value	34,357,000
Recurring basis | Level 1 | Money market funds
Fair value measurements
Money market funds	34,357,000
Recurring basis | Level 2
Fair value measurements
Total assets measured at fair value	377,000
Recurring basis | Level 2 | Certificate of deposit
Fair value measurements
Certificates of deposit	$ 377,000

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

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-Name Accounting Standards Codification
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 210
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