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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair value measurements |  |
Equity investments with readily determinable fair values | $ 300 | $ 600
Impairment or price adjustments for strategic investments | 0 |
Loss on equity securities | 300 |
Carrying Value |  |
Fair value measurements |  |
Long-term debt | 91,000 | 155,800
Carrying Value | Other Assets |  |
Fair value measurements |  |
Strategic investments | 23,100 | 20,100
Level 2 | Estimated Fair Value |  |
Fair value measurements |  |
Long-term debt | 91,600 | 159,200
Recurring basis |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | 17,151 | 60,367
Recurring basis | Interest rate swap |  |
Fair value measurements |  |
Derivative liabilities | 140 | 52
Recurring basis | Certificate of deposit |  |
Fair value measurements |  |
Cash and cash equivalents | 380 | 391
Recurring basis | Money market funds |  |
Fair value measurements |  |
Cash and cash equivalents | 2,266 | 2,894
Recurring basis | Short Term Investments |  |
Fair value measurements |  |
Investments | 393 | 7,076
Recurring basis | Commercial paper |  |
Fair value measurements |  |
Cash and cash equivalents | 13,972 | 49,954
Recurring basis | Level 1 |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | 2,659 | 3,449
Recurring basis | Level 1 | Money market funds |  |
Fair value measurements |  |
Cash and cash equivalents | 2,266 | 2,894
Recurring basis | Level 1 | Short Term Investments |  |
Fair value measurements |  |
Investments | 393 | 555
Recurring basis | Level 2 |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | 14,492 | 56,918
Recurring basis | Level 2 | Interest rate swap |  |
Fair value measurements |  |
Derivative liabilities | 140 | 52
Recurring basis | Level 2 | Certificate of deposit |  |
Fair value measurements |  |
Cash and cash equivalents | 380 | 391
Recurring basis | Level 2 | Short Term Investments |  |
Fair value measurements |  |
Investments |  | 6,521
Recurring basis | Level 2 | Commercial paper |  |
Fair value measurements |  |
Cash and cash equivalents | $ 13,972 | $ 49,954

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- Definition 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 No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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- Definition Amount of cumulative impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + 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 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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