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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Marketable Securities |
Marketable Securities | 3. Marketable Securities The Company’s marketable securities held as of December 31, 2017 and 2016 are summarized below:
|  | 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
|  | December 31, 2016
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |
|  | Cost |  | Gains |  | Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 12,137 |  | $ | — |  | $ | — |  | $ | 12,137
Corporate Securities |  |  | 182,394 |  |  | 6 |  |  | (917) |  |  | 181,483
Government Securities |  |  | 207,986 |  |  | 44 |  |  | (565) |  |  | 207,465
|  | $ | 402,517 |  | $ | 50 |  | $ | (1,482) |  | $ | 401,085
Reported as |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ | 12,137
Marketable securities |  |  |  |  |  |  |  |  |  |  |  | 388,948
Total investments |  |  |  |  |  |  |  |  |  |  | $ | 401,085
The maturities of the Company’s marketable securities as of December 31, 2017 are as follows:
|  | Amortized |  | Estimated
|  | Cost |  | Fair Value
(in thousands) |  |  |  |  |  |
Mature in one year or less |  | $ | 208,200 |  | $ | 207,603
Mature after one year through five years |  |  | 140,399 |  |  | 139,197
|  | $ | 348,599 |  | $ | 346,800
The unrealized losses on available-for-sale investments and their related fair values as of December 31, 2017 and 2016 are as follows:
|  | 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)
|  | December 31, 2016
|  | Less than 12 months |  | 12 months or greater
|  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Corporate Securities |  | $ | 82,215 |  | $ | (133) |  | $ | 88,990 |  | $ | (784)
Government Securities |  |  | 17,573 |  |  | (16) |  |  | 149,694 |  |  | (549)
|  | $ | 99,788 |  | $ | (149) |  | $ | 238,684 |  | $ | (1,333)
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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