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Fair Value Measurement | 12 Months Ended
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Dec. 31, 2018
Fair Value Measurement [Abstract] |
Fair Value Measurement | Note 12 − Fair Value Measurement We apply fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 2 – Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 – Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability. The carrying amounts for cash and cash equivalents, investments in certificates of deposit, accounts payable and accrued expenses approximate their fair values due to the short period of time until maturity. Mutual funds: Valued at the quoted net asset value (NAV) of shares held. U.S. agency securities: Fair value measured at the closing price reported on the active market on which the individual securities are traded. The following table shows our cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents of investments available for sale as of December 31, 2018 and 2017 (in thousands):
|  | December 31, 2018 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Investments Available for Sale |
Cash |  | $ | 5,048 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,048 |  |  | $ | 5,048 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 1,107 |  |  |  | — |  |  |  | — |  |  |  | 1,107 |  |  |  | 1,107 |  |  |  | — |
U.S. agency securities |  |  | 3,259 |  |  |  | — |  |  |  | — |  |  |  | 3,259 |  |  |  | 1,456 |  |  |  | 1,803 |
|  |  | 4,366 |  |  |  | — |  |  |  | — |  |  |  | 4,366 |  |  |  | 2,563 |  |  |  | 1,803 |
Total |  | $ | 9,414 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,414 |  |  | $ | 7,611 |  |  | $ | 1,803 |
|  | December 31, 2017 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Investments Available for Sale |
Cash |  | $ | 1,972 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,972 |  |  | $ | 1,972 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 616 |  |  | $ | — |  |  |  | — |  |  |  | 616 |  |  |  | 616 |  |  |  | — |
U.S. agency securities |  |  | 2,001 |  |  | $ | — |  |  |  | (1 | ) |  |  | 2,000 |  |  |  | 547 |  |  |  | 1,453 |
|  |  | 2,617 |  |  | $ | — |  |  |  | (1 | ) |  |  | 2,616 |  |  |  | 1,163 |  |  |  | 1,453 |
Total |  | $ | 4,589 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 4,588 |  |  | $ | 3,135 |  |  | $ | 1,453 |
The maturities of our marketable securities generally range from within one to two years. Actual maturities could differ from contractual maturities due to call or prepayment provisions.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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