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Cash, Cash Equivalents and Marketable Securities | 3 Months Ended
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Mar. 31, 2014
Cash, Cash Equivalents and Marketable Securities | 3. Cash, cash equivalents and marketable securities The following is a summary of cash, cash equivalents and marketable securities available-for-sale as of March 31, 2014 and December 31, 2013 (in thousands):
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
March 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 1,554 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,554 |
Money market funds |  | 25,196 |  |  |  | - |  |  |  | - |  |  |  | 25,196 |
Total cash and cash equivalents |  | 26,750 |  |  |  | - |  |  |  | - |  |  |  | 26,750 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  | 150,891 |  |  |  | 47 |  |  |  | (9 | ) |  |  | 150,929 |
Total marketable securities available-for-sale |  | 150,891 |  |  |  | 47 |  |  |  | (9 | ) |  |  | 150,929 |
Total cash, cash equivalents and marketable securities | $ | 177,641 |  |  | $ | 47 |  |  | $ | (9 | ) |  | $ | 177,679 |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 1,766 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,766 |
Money market funds |  | 20,013 |  |  |  | - |  |  |  | - |  |  |  | 20,013 |
U.S. government agency securities |  | 1,343 |  |  |  | - |  |  |  | - |  |  |  | 1,343 |
Total cash and cash equivalents |  | 23,122 |  |  |  | - |  |  |  | - |  |  |  | 23,122 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  | 166,285 |  |  |  | 16 |  |  |  | (47 | ) |  |  | 166,254 |
Total marketable securities available-for-sale |  | 166,285 |  |  |  | 16 |  |  |  | (47 | ) |  |  | 166,254 |
Total cash, cash equivalents and marketable securities | $ | 189,407 |  |  | $ | 16 |  |  | $ | (47 | ) |  | $ | 189,376 |
The maturities of our marketable securities available-for-sale are as follows (in thousands):
|  | March 31, 2014 |
|  | Amortized Cost |  |  | Estimated Fair Value |
Mature in one year or less |  | $ | 86,050 |  |  | $ | 86,070 |
Mature after one year through two years |  |  | 64,841 |  |  |  | 64,859 |
|  | $ | 150,891 |  |  | $ | 150,929 |
We have classified our entire investment portfolio as available-for-sale a nd available for use in current operations and accordingly have classified all investments as short-term. Available-for-sale securities are carried at fair value based on inputs that are observable, either directly or indirectly, such as quoted market prices for similar securities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the securities, with unrealized gains and losses included in accumulated other comprehensive income (loss) in stockholders’ equity. Realized gains and losses and declines in value, if any, judged to be other than temporary on available-for-sale securities are included in interest income or expense. The cost of securities sold is based on the specific identification method. Management assesses whether declines in the fair value of investment securities are other than temporary. In determining whether a decline is other than temporary, management considers the following factors:
· | Whether the investment has been in a continuous realized loss position for over 12 months;
· | the duration to maturity of our investments;
· | our intention and ability to hold the investments to maturity and if it is not more likely than not that we will be required to sell the investment before recovery of the amortized cost bases;
· | the credit rating, financial condition and near-term prospects of the issuer; and
· | the type of investments made.
To date, there have been no declines in fair value that have been identified as other than temporary.

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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 No definition available. + Details
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