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Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Marketable Securities |
Marketable Securities | 3. Marketable Securities The Company’s marketable debt securities held as of December 31, 2018 and 2017 are summarized below:
|  | December 31, 2018
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
|  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 18,270 |  | $ | — |  | $ | — |  | $ | 18,270
Corporate Securities |  |  | 105,311 |  |  | 1 |  |  | (345) |  |  | 104,967
Government Securities |  |  | 399,873 |  |  | 187 |  |  | (804) |  |  | 399,256
|  | $ | 523,454 |  | $ | 188 |  | $ | (1,149) |  | $ | 522,493
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 18,270
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 504,223
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 522,493
|  | December 31, 2017
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
|  | 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 debt securities as of December 31, 2018 are as follows:
|  | Amortized |  | Estimated
|  | Cost |  | Fair Value
(in thousands) |  |  |  |  |  |
Mature in one year or less |  | $ | 269,092 |  | $ | 268,115
Mature after one year through five years |  |  | 236,092 |  |  | 236,108
|  | $ | 505,184 |  | $ | 504,223
The unrealized losses on available-for-sale investments and their related fair values as of December 31, 2018 and 2017 are as follows:
|  | December 31, 2018
|  | Less than 12 months |  | 12 months or greater
|  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized gain (losses)
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 84,770 |  | $ | (310) |  | $ | 20,198 |  | $ | (34)
Government Securities |  |  | 183,345 |  |  | (667) |  |  | 215,910 |  |  | 50
|  | $ | 268,115 |  | $ | (977) |  | $ | 236,108 |  | $ | 16
|  | December 31, 2017
|  | Less than 12 months |  | 12 months or greater
|  |  | 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.

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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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