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Cash, Cash Equivalents, Restricted Cash and Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Investments Debt And Equity Securities [Abstract] |
Cash, Cash Equivalents, Restricted Cash and Marketable Securities |
4. | Cash, Cash Equivalents, Restricted Cash and Marketable Securities
The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows:
|  | December 31 |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Cash and cash equivalents |  | $ | 49,348 |  |  | $ | 26,584 |  |  | $ | 24,289 |
Restricted cash |  |  | 619 |  |  |  | 629 |  |  |  | 602 |
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows |  | $ | 49,967 |  |  | $ | 27,213 |  |  | $ | 24,891 |
Restricted cash balances relate to certificates of deposit issued as collateral to certain letters of credit issued as security to our lease arrangements. See Note 9. Cash, cash equivalents and marketable securities consist of the following (in thousands):
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,147 |  |  | $ | - |  |  | $ | - |  |  | $ | 3,147 |
Money market funds |  | 44,002 |  |  |  | - |  |  |  | - |  |  |  | 44,002 |
Corporate debt securities |  | 2,199 |  |  |  | - |  |  |  | - |  |  |  | 2,199 |
Total cash and cash equivalents |  | 49,348 |  |  |  | - |  |  |  | - |  |  |  | 49,348 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | 14,732 |  |  |  | - |  |  |  | (8 | ) |  |  | 14,724 |
U.S. government agency securities |  | 42,416 |  |  |  | - |  |  |  | (44 | ) |  |  | 42,372 |
Corporate debt securities |  | 39,108 |  |  |  | - |  |  |  | (16 | ) |  |  | 39,092 |
Total marketable securities available-for-sale |  | 96,256 |  |  |  | - |  |  |  | (68 | ) |  |  | 96,188 |
Total cash, cash equivalents and marketable securities | $ | 145,604 |  |  | $ | - |  |  | $ | (68 | ) |  | $ | 145,536 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 4,041 |  |  | $ | - |  |  | $ | - |  |  | $ | 4,041 |
Money market funds |  | 22,543 |  |  |  | - |  |  |  | - |  |  |  | 22,543 |
Total cash and cash equivalents |  | 26,584 |  |  |  | - |  |  |  | - |  |  |  | 26,584 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | 45,559 |  |  |  | - |  |  |  | (25 | ) |  |  | 45,534 |
U.S. government agency securities |  | 86,860 |  |  |  | - |  |  |  | (40 | ) |  |  | 86,820 |
Corporate debt securities |  | 32,931 |  |  |  | - |  |  |  | (15 | ) |  |  | 32,916 |
Total marketable securities available-for-sale |  | 165,350 |  |  |  | - |  |  |  | (80 | ) |  |  | 165,270 |
Total cash, cash equivalents and marketable securities | $ | 191,934 |  |  | $ | - |  |  | $ | (80 | ) |  | $ | 191,854 |
The maturities of our marketable securities available-for-sale are as follows (in thousands):
. |  | December 31, 2018 |
|  | Amortized Cost |  |  | Estimated Fair Value |
Mature in one year or less |  | $ | 96,256 |  |  | $ | 96,188 |
Mature after one year through two years |  |  | - |  |  |  | - |
|  | $ | 96,256 |  |  | $ | 96,188 |
There were no realized gains or losses from the sale of marketable securities in the years ended December 31, 2018, 2017 and 2016. All of our investments are classified as short-term and available-for-sale, as we consider them available to fund current operations and may not hold our investments until maturity.

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- Definition The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) 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. Generally, only investments maturing within three months from the date of acquisition qualify. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 + Details
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