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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of available-for-sale securities | The following is a summary of available-for-sale securities at:
($ in thousands) |  | March 31, 2019 |  | December 31, 2018
Marketable Securities: | Fair Value Hierarchy | Cost |  | Fair Value |  | Cost |  | Fair Value
Certificates of deposit |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  | $ | — |  |  | $ | — |  |  | $ | 250 |  |  | $ | 248 |
with unrecognized losses for more than 12 months |  | 4,012 |  |  | 3,991 |  |  | 3,861 |  |  | 3,812 |
with unrecognized gains |  | — |  |  | — |  |  | — |  |  | — |
Total Certificates of deposit | Level 1 | 4,012 |  |  | 3,991 |  |  | 4,111 |  |  | 4,060 |
U.S. Treasury and agency notes |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  | 4,064 |  |  | 4,058 |  |  | 3,112 |  |  | 3,105 |
with unrecognized losses for more than 12 months |  | 19,472 |  |  | 19,391 |  |  | 23,564 |  |  | 23,415 |
with unrecognized gains |  | 2 |  |  | 3 |  |  | 3 |  |  | 4 |
Total U.S. Treasury and agency notes | Level 2 | 23,538 |  |  | 23,452 |  |  | 26,679 |  |  | 26,524 |
Corporate notes |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  | 14,780 |  |  | 14,760 |  |  | 13,696 |  |  | 13,665 |
with unrecognized losses for more than 12 months |  | 9,383 |  |  | 9,334 |  |  | 12,542 |  |  | 12,431 |
with unrecognized gains |  | 1,795 |  |  | 1,797 |  |  | — |  |  | — |
Total Corporate notes | Level 2 | 25,958 |  |  | 25,891 |  |  | 26,238 |  |  | 26,096 |
Municipal notes |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  | — |  |  | — |  |  | 2,994 |  |  | 2,982 |
with unrecognized losses for more than 12 months |  | 6,949 |  |  | 6,936 |  |  | 4,116 |  |  | 4,087 |
with unrecognized gains |  | — |  |  | — |  |  | — |  |  | — |
Total Municipal notes | Level 2 | 6,949 |  |  | 6,936 |  |  | 7,110 |  |  | 7,069 |
|  | $ | 60,457 |  |  | $ | 60,270 |  |  | $ | 64,138 |  |  | $ | 63,749 |
Summary of maturities, at par, of marketable securities by year | The following tables summarize the maturities, at par, of marketable securities as of:
| March 31, 2019
($ in thousands) | 2019 |  | 2020 |  | 2021 |  | Total
Certificates of deposit | $ | 2,212 |  |  | $ | 1,799 |  |  | $ | — |  |  | $ | 4,011 |
U.S. Treasury and agency notes | 13,414 |  |  | 10,173 |  |  | — |  |  | 23,587 |
Corporate notes | 11,871 |  |  | 13,700 |  |  | 400 |  |  | 25,971 |
Municipal notes | 4,951 |  |  | 2,000 |  |  | — |  |  | 6,951 |
| $ | 32,448 |  |  | $ | 27,672 |  |  | $ | 400 |  |  | $ | 60,520 |
| December 31, 2018
($ in thousands) | 2019 |  | 2020 |  | 2021 |  | Total
Certificates of deposit | $ | 2,311 |  |  | $ | 1,799 |  |  | $ | — |  |  | $ | 4,110 |
U.S. Treasury and agency notes | 17,574 |  |  | 9,174 |  |  | — |  |  | 26,748 |
Corporate notes | 18,671 |  |  | 7,150 |  |  | 400 |  |  | 26,221 |
Municipal notes | 5,111 |  |  | 2,000 |  |  | — |  |  | 7,111 |
| $ | 43,667 |  |  | $ | 20,123 |  |  | $ | 400 |  |  | $ | 64,190 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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