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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Total | $ 53,902 | $ 12,367
Quoted Prices in Active Market (Level 1) |  |
Assets: |  |
Total | 35,096 | 8,111
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total | 18,806 | 4,256
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total | 0 | 0
Fair Value, Measurements, Recurring | Money market funds |  |
Assets: |  |
Cash equivalents | 11,588 | 8,111
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Market (Level 1) |  |
Assets: |  |
Cash equivalents | 11,588 | 8,111
Fair Value, Measurements, Recurring | Money market funds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Money market funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | 0 | 0
Money market funds | Fair Value, Measurements, Recurring |  |
Assets: |  |
Funds held for clients | 23,508 | 0
Money market funds | Fair Value, Measurements, Recurring | Quoted Prices in Active Market (Level 1) |  |
Assets: |  |
Funds held for clients | 23,508 | 0
Money market funds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Funds held for clients | 0 | 0
Money market funds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Funds held for clients | 0 | 0
Available-for-sale securities | Fair Value, Measurements, Recurring |  |
Assets: |  |
Funds held for clients | 18,806 | 4,256
Available-for-sale securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Market (Level 1) |  |
Assets: |  |
Funds held for clients | 0 | 0
Available-for-sale securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Funds held for clients | 18,806 | 4,256
Available-for-sale securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Funds held for clients | $ 0 | $ 0

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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 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 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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