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Cash, Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash Cash Equivalents And Short Term Investments [Abstract] |
Summary of Cash, Cash Equivalents and Marketable Securities | Cash, cash equivalents and marketable securities consist of the following (in thousands):
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 4,041 |  |  | $ | - |  |  | $ | - |  |  | $ | 4,041 |
Money market funds |  | 22,543 |  |  |  | - |  |  |  | - |  |  |  | 22,543 |
Total cash and cash equivalents |  | 26,584 |  |  |  | - |  |  |  | - |  |  |  | 26,584 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | 45,559 |  |  |  | - |  |  |  | (25 | ) |  |  | 45,534 |
U.S. government agency securities |  | 86,860 |  |  |  | - |  |  |  | (40 | ) |  |  | 86,820 |
Corporate debt securities |  | 32,931 |  |  |  | - |  |  |  | (15 | ) |  |  | 32,916 |
Total marketable securities available-for-sale |  | 165,350 |  |  |  | - |  |  |  | (80 | ) |  |  | 165,270 |
Total cash, cash equivalents and marketable securities | $ | 191,934 |  |  | $ | - |  |  | $ | (80 | ) |  | $ | 191,854 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,557 |  |  | $ | - |  |  | $ | - |  |  | $ | 3,557 |
Money market funds |  | 18,981 |  |  |  | - |  |  |  | - |  |  |  | 18,981 |
U.S. government agency securities |  | 1,751 |  |  |  | - |  |  |  | - |  |  |  | 1,751 |
Total cash and cash equivalents |  | 24,289 |  |  |  | - |  |  |  | - |  |  |  | 24,289 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | 3,499 |  |  |  | - |  |  |  | - |  |  |  | 3,499 |
U.S. government agency securities |  | 28,685 |  |  |  | 3 |  |  |  | (2 | ) |  |  | 28,686 |
Corporate debt securities |  | 24,938 |  |  |  | 5 |  |  |  | (2 | ) |  |  | 24,941 |
Total marketable securities available-for-sale |  | 57,122 |  |  |  | 8 |  |  |  | (4 | ) |  |  | 57,126 |
Total cash, cash equivalents and marketable securities | $ | 81,411 |  |  | $ | 8 |  |  | $ | (4 | ) |  | $ | 81,415 |
Maturities of Marketable Securities Available-for-Sale | The maturities of our marketable securities available-for-sale are as follows (in thousands):
|  | December 31, 2017 |
|  | Amortized Cost |  |  | Estimated Fair Value |
Mature in one year or less |  | $ | 165,350 |  |  | $ | 165,270 |
Mature after one year through two years |  |  | - |  |  |  | - |
|  | $ | 165,350 |  |  | $ | 165,270 |

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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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