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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Available-For-Sale Securities | Available-for-sale marketable securities as of December 31, 2017 and 2016 were as follows (in thousands):
| December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | 3,995 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 3,989 |
Government-sponsored enterprises | 11,998 |  |  | — |  |  | (7 | ) |  | 11,991 |
Corporate debt securities | 77,462 |  |  | 2 |  |  | (50 | ) |  | 77,414 |
Total | $ | 93,455 |  |  | $ | 2 |  |  | $ | (63 | ) |  | $ | 93,394 |
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | 4,826 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 4,825 |
Government-sponsored enterprises | 29,764 |  |  | 5 |  |  | (10 | ) |  | 29,759 |
Corporate debt securities | 166,376 |  |  | 51 |  |  | (127 | ) |  | 166,300 |
Total | $ | 200,966 |  |  | $ | 56 |  |  | $ | (138 | ) |  | $ | 200,884 |
All of the Company's available-for-sale securities held at December 31, 2017 had maturity dates of less than one year. The contractual maturities of the available-for-sale marketable securities as of December 31, 2016 were as follows (in thousands):
| Amortized Cost |  | Fair Value
Mature in one year or less | $ | 192,985 |  |  | $ | 192,898 |
Mature between one and five years | 7,981 |  |  | 7,986 |
Total | $ | 200,966 |  |  | $ | 200,884 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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