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FAIR VALUE MEASUREMENTS | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | 12. FAIR VALUE MEASUREMENTS Assets and liabilities measured at fair value on a recurring basis The Company records its cash equivalents, marketable securities, and investments in privately-held companies at fair value on a recurring basis. Fair value is an exit price, representing the amount that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants based on assumptions that market participants would use in pricing an asset or liability. As a basis for classifying the fair value measurements, a three-tier fair value hierarchy, which classifies the fair value measurements based on the inputs used in measuring fair value, was established as follows:
• | Level 1 - observable inputs such as quoted prices in active markets for identical assets or liabilities;
• | Level 2 - significant other inputs that are observable either directly or indirectly; and
• | Level 3 - significant unobservable inputs on which there is little or no market data, which require the Company to develop its own assumptions. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value.
The Company’s cash equivalents are composed of money market funds and time deposits, which are classified within Level 1 and Level 2, respectively, in the fair value hierarchy. The Company’s marketable securities, which are classified within Level 2 of the fair value hierarchy, are valued based on a market approach using quoted prices, when available, or matrix pricing compiled by third party pricing vendors, using observable market inputs such as interest rates, yield curves, and credit risk. The Company’s investments in privately-held companies are classified within Level 3 of the fair value hierarchy and are valued using model-based techniques, including option pricing models and discounted cash flow models. If applicable, the Company will recognize transfers into and out of levels within the fair value hierarchy at the end of the reporting period in which the actual event or change in circumstance occurs. There were no transfers between levels during 2019, 2018, or 2017. The Company’s assets and liabilities measured at fair value on a recurring basis were:
| December 31, 2019
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Investments in privately-held companies (1) | $ | — |  |  | $ | — |  |  | $ | 4,871 |  |  | $ | 4,871 |
(1) Included in other long-term assets.
| December 31, 2018
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents | $ | 10,155 |  |  | $ | 10,000 |  |  | $ | — |  |  | $ | 20,155 |
Marketable securities: |  |  |  |  |  |  |
Municipal bonds | $ | — |  |  | $ | 44,705 |  |  | $ | — |  |  | $ | 44,705 |
Corporate bonds | — |  |  | 48,296 |  |  | — |  |  | 48,296 |
Total marketable securities | $ | — |  |  | $ | 93,001 |  |  | $ | — |  |  | $ | 93,001 |
Investments in privately-held companies (1) | $ | — |  |  | $ | — |  |  | $ | 3,390 |  |  | $ | 3,390 |
(1) Included in other long-term assets. For certain other financial instruments, including accounts receivable, unbilled receivables, and accounts payable, the carrying value approximates fair value due to the relatively short maturity of these items. Assets measured at fair value on a nonrecurring basis Assets recorded at fair value on a nonrecurring basis, including property and equipment and intangible assets, are recognized at fair value when they are impaired. The Company did not recognize any impairments on its assets measured at fair value on a nonrecurring basis during 2019, 2018, or 2017. Credit risk In addition to receivables, the Company is potentially subject to concentrations of credit risk from the Company’s cash, cash equivalents, and marketable securities. The Company’s cash and cash equivalents are generally held with large, diverse financial institutions worldwide to reduce the credit risk exposure. Investment policies have been implemented that limit purchases of marketable debt securities to investment-grade securities.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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