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Cash, Cash Equivalents and Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Cash Cash Equivalents And Short Term Investments [Abstract] |
Cash, Cash Equivalents and Marketable Securities |
4. | Cash, Cash Equivalents and Marketable Securities
Cash, cash equivalents and marketable securities consist of the following (in thousands):
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
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 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,557 |  |  | $ | - |  |  | $ | - |  |  | $ | 3,557 |
Money market funds |  | 18,981 |  |  |  | - |  |  |  | - |  |  |  | 18,981 |
U.S. government agency securities |  | 1,751 |  |  |  | - |  |  |  | - |  |  |  | 1,751 |
Total cash and cash equivalents |  | 24,289 |  |  |  | - |  |  |  | - |  |  |  | 24,289 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | 3,499 |  |  |  | - |  |  |  | - |  |  |  | 3,499 |
U.S. government agency securities |  | 28,685 |  |  |  | 3 |  |  |  | (2 | ) |  |  | 28,686 |
Corporate debt securities |  | 24,938 |  |  |  | 5 |  |  |  | (2 | ) |  |  | 24,941 |
Total marketable securities available-for-sale |  | 57,122 |  |  |  | 8 |  |  |  | (4 | ) |  |  | 57,126 |
Total cash, cash equivalents and marketable securities | $ | 81,411 |  |  | $ | 8 |  |  | $ | (4 | ) |  | $ | 81,415 |
The maturities of our marketable securities available-for-sale are as follows (in thousands):
|  | December 31, 2017 |
|  | Amortized Cost |  |  | Estimated Fair Value |
Mature in one year or less |  | $ | 165,350 |  |  | $ | 165,270 |
Mature after one year through two years |  |  | - |  |  |  | - |
|  | $ | 165,350 |  |  | $ | 165,270 |
There were no realized gains or losses from the sale of marketable securities in the years ended December 31, 2017, 2016 and 2015. 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 of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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