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Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Marketable Securities |
Marketable Securities | (5) Marketable Securities The following is a summary of marketable securities, classified as available-for-sale:
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  | (In thousands)
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 27,355 |  | $ | — |  | $ | (4) |  | $ | 27,351
Maturing after one year through three years |  |  | — |  |  | — |  |  | — |  |  | —
Total U.S. government and municipal obligations |  | $ | 27,355 |  | $ | — |  | $ | (4) |  | $ | 27,351
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 42,370 |  | $ | — |  | $ | (9) |  | $ | 42,361
Maturing after one year through three years |  |  | — |  |  | — |  |  | — |  |  | —
Total corporate debt securities |  | $ | 42,370 |  | $ | — |  | $ | (9) |  | $ | 42,361
Total marketable securities |  | $ | 69,725 |  | $ | — |  | $ | (13) |  | $ | 69,712
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 26,164 |  | $ | 3 |  | $ | (9) |  | $ | 26,158
Maturing after one year through three years |  |  | — |  |  | — |  |  | — |  |  | —
Total U.S. government and municipal obligations |  | $ | 26,164 |  | $ | 3 |  | $ | (9) |  | $ | 26,158
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 73,007 |  | $ | 1 |  | $ | (27) |  | $ | 72,981
Maturing after one year through three years |  |  | — |  |  | — |  |  | — |  |  | —
Total corporate debt securities |  | $ | 73,007 |  | $ | 1 |  | $ | (27) |  | $ | 72,981
Total marketable securities |  | $ | 99,171 |  | $ | 4 |  | $ | (36) |  | $ | 99,139
The Company holds investment grade marketable securities, and none were considered to be other‑than‑temporarily impaired as of December 31, 2018. Marketable securities include $0.1 million and $0.3 million in accrued interest at December 31, 2018 and December 31, 2017, respectively.

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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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