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Marketable Securities | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Available-for-sale marketable securities as of March 31, 2019 and December 31, 2018 were as follows (in thousands):
| March 31, 2019 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | — |  | $ | — |  | $ | — |  | $ | —
Government-sponsored enterprises | 17,389 |  | 1 |  | — |  | 17,390
Corporate debt securities | 64,361 |  | 5 |  | (6) |  | 64,360
Total | $ | 81,750 |  | $ | 6 |  | $ | (6) |  | $ | 81,750
| December 31, 2018 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 12,738 |  | $ | — |  | $ | (3) |  | $ | 12,735
All available-for-sale marketable securities held as of March 31, 2019 and December 31, 2018 had contractual maturities of less than one year. All of the Company's available-for-sale marketable securities in an unrealized loss position as of March 31, 2019 and December 31, 2018 were in a loss position for less than 12 months. There were no unrealized losses at March 31, 2019 or December 31, 2018 that the Company determined to be other-than-temporary.

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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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