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Cash and Cash Equivalents, and Investments | 12 Months Ended
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Dec. 31, 2019
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalents, and Investments | Cash and Cash Equivalents, and Investments The following table shows our cash and cash equivalents, and investments’ adjusted cost, unrealized gain, unrealized loss and fair value as of December 31, 2019 and 2018 (in thousands):
| December 31, 2019
| Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 241,355 |  |  | $ | — |  |  | $ | — |  |  | $ | 241,355 |
Money market funds | 146,165 |  |  | — |  |  | — |  |  | 146,165 |
Total cash and cash equivalents | $ | 387,520 |  |  | $ | — |  |  | $ | — |  |  | $ | 387,520 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 7,489 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,489 |
Corporate securities | 318,946 |  |  | 425 |  |  | (78 | ) |  | 319,293 |
U.S. treasury securities | 44,251 |  |  | 39 |  |  | (4 | ) |  | 44,286 |
Agency bond | 10,000 |  |  | 6 |  |  | — |  |  | 10,006 |
Total short-term investments | $ | 380,686 |  |  | $ | 470 |  |  | $ | (82 | ) |  | $ | 381,074 |
Long-term investments |  |  |  |  |  |  |
Corporate securities | $ | 295,103 |  |  | $ | 533 |  |  | $ | (158 | ) |  | $ | 295,478 |
Agency bond | 14,999 |  |  | 6 |  |  | — |  |  | 15,005 |
Total long-term investments | $ | 310,102 |  |  | $ | 539 |  |  | $ | (158 | ) |  | $ | 310,483 |
| December 31, 2018
| Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 351,345 |  |  | $ | — |  |  | $ | — |  |  | $ | 351,345 |
Money market funds | 5,052 |  |  | — |  |  | — |  |  | 5,052 |
Commercial paper | 18,267 |  |  | — |  |  | — |  |  | 18,267 |
Total cash and cash equivalents | $ | 374,664 |  |  | $ | — |  |  | $ | — |  |  | $ | 374,664 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 40,500 |  |  | $ | — |  |  | $ | (12 | ) |  | $ | 40,488 |
Corporate securities | 38,616 |  |  | — |  |  | (87 | ) |  | 38,529 |
U.S. treasury securities | 14,333 |  |  | — |  |  | (5 | ) |  | 14,328 |
Total short-term investments | $ | 93,449 |  |  | $ | — |  |  | $ | (104 | ) |  | $ | 93,345 |
Long-term investments |  |  |  |  |  |  |
Corporate securities | $ | 14,429 |  |  | $ | 9 |  |  | $ | (14 | ) |  | $ | 14,424 |
U.S. treasury securities | 1,630 |  |  | — |  |  | (2 | ) |  | 1,628 |
Total long-term investments | $ | 16,059 |  |  | $ | 9 |  |  | $ | (16 | ) |  | $ | 16,052 |
The adjusted cost and fair value of investments as of December 31, 2019 by contractual maturity were as follows (in thousands):
| December 31, 2019
| Cost |  | Fair Value
Due in 1 year or less | $ | 380,686 |  |  | $ | 381,074 |
Due in 1-2 years | 310,102 |  |  | 310,483 |
Investments not due at a single maturity date | 146,165 |  |  | 146,165 |
Total | $ | 836,953 |  |  | $ | 837,722 |
Investments not due at a single maturity date in the preceding table consist of money market fund deposits. As of December 31, 2019, we considered the declines in market value of our investment portfolio to be temporary in nature and did not consider any of our investments to be other-than-temporarily impaired. We typically invest in highly-rated securities with a minimum credit rating of A- and a weighted average maturity of nine months, and our investment policy generally limits the amount of credit exposure to any one issuer or industry sector. The policy requires investments generally to be investment grade, with the primary objective of preserving capital and maintaining liquidity. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates and our intent to sell, or whether it is more likely than not we will be required to sell, the investment before recovery of the investment’s cost basis. During the years ended December 31, 2019, 2018, and 2017 we did not recognize any other-than-impairment charges. Restricted Cash As of December 31, 2019 and 2018, we had approximately $1.9 million and $1.3 million, respectively, of restricted cash that primarily consists of security deposits for our corporate offices. As of December 31, 2019 and 2018, $0.1 million of restricted cash is classified in other current assets in our consolidated balance sheets. As of December 31, 2019 and 2018, $1.8 million and $1.2 million, respectively, of restricted cash is classified in other assets in our consolidated balance sheets. These amounts are classified based upon the term of the remaining restrictions. Strategic Investments In October 2018, we completed an investment of $10.0 million in WayUp, Inc., a U.S.-based job site and mobile application for college students and recent graduates. Additionally, we previously invested $3.0 million in a foreign entity to explore expanding our reach internationally. We did not record any impairment charges on our strategic investments during the years ended December 31, 2019, 2018, and 2017, as there were no significant identified events or changes in circumstances that would be considered an indicator for impairment. There were no observable price changes in orderly transactions for the identical or similar investments of the same issuers during the years ended December 31, 2019 and 2018.

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- Definition The entire disclosure for cash, cash equivalents, investments in debt and equity instruments (including cost and equity investees and related income statement amounts), equity and cost method investments, investments in joint ventures and any other investment. + References No definition available. + Details
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