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Marketable Securities | 9 Months Ended
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Sep. 30, 2018
Marketable Securities |
Marketable Securities | 5. Marketable Securities The Company’s marketable securities held as of September 30, 2018 and December 31, 2017 are summarized below:
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
September 30, 2018 |  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 15,632 |  | $ | — |  | $ | — |  | $ | 15,632
Corporate Securities |  |  | 98,498 |  |  | 1 |  |  | (471) |  |  | 98,028
Government Securities |  |  | 416,664 |  |  | — |  |  | (1,859) |  |  | 414,805
|  | $ | 530,794 |  | $ | 1 |  | $ | (2,330) |  | $ | 528,465
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 15,632
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 512,833
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 528,465
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
December 31, 2017 |  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 5,175 |  | $ | — |  | $ | — |  | $ | 5,175
Corporate Securities |  |  | 123,860 |  |  | — |  |  | (590) |  |  | 123,270
Government Securities |  |  | 224,739 |  |  | — |  |  | (1,209) |  |  | 223,530
|  | $ | 353,774 |  | $ | — |  | $ | (1,799) |  | $ | 351,975
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 5,175
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 346,800
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 351,975
The maturities of the Company’s marketable securities are as follows:
|  | Amortized |  | Estimated
September 30, 2018 |  | Cost |  | Fair Value
(in thousands) |  |  |  |  |  |
Mature in one year or less |  | $ | 237,736 |  | $ | 236,605
Mature within two years |  |  | 277,426 |  |  | 276,228
|  | $ | 515,162 |  | $ | 512,833
The unrealized losses on available-for-sale investments and their related fair values as of September 30, 2018 and December 31, 2017 are as follows:
|  | Less than 12 months |  | 12 months or greater
September 30, 2018 |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 69,494 |  | $ | (411) |  | $ | 28,534 |  | $ | (60)
Government Securities |  |  | 167,111 |  |  | (720) |  |  | 247,694 |  |  | (1,139)
|  | $ | 236,605 |  | $ | (1,131) |  | $ | 276,228 |  | $ | (1,199)
|  | Less than 12 months |  | 12 months or greater
December 31, 2017 |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 79,290 |  | $ | (137) |  | $ | 43,980 |  | $ | (453)
Government Securities |  |  | 128,313 |  |  | (461) |  |  | 95,217 |  |  | (748)
|  | $ | 207,603 |  | $ | (598) |  | $ | 139,197 |  | $ | (1,201)
The unrealized losses from the listed securities are due to a change in the interest rate environment and not a change in the credit quality of the securities. The Company does not intend to sell these securities, and it is not more likely than not that the Company will be required to sell the securities before recovery of the amortized cost basis. Therefore, the Company did not consider these securities to be other-than-temporarily impaired as of September 30, 2018 and December 31, 2017.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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