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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
Fair Value Disclosures [Abstract] |
Schedule of cash and available-for-sale securities | The following tables summarize our cash and available-for-sale securities that were measured at fair value by significant investment category within the fair value hierarchy (in thousands):
| September 30, 2020 |  |
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | Cash and Cash Equivalents |  | Short-Term Marketable Securities |  | Cash- Restricted |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash-unrestricted | $ | 49,144 |  |  | $ | — |  |  | $ | — |  |  | $ | 49,144 |  |  | $ | 49,144 |  |  | $ | — |  |  | $ | — |  |  |
Cash-restricted | 1,015 |  |  | — |  |  | — |  |  | 1,015 |  |  | — |  |  | — |  |  | 1,015 |  |  |
Total cash | $ | 50,159 |  |  | $ | — |  |  | $ | — |  |  | $ | 50,159 |  |  | $ | 49,144 |  |  | $ | — |  |  | $ | 1,015 |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 23,201 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,201 |  |  | $ | 23,201 |  |  | $ | — |  |  | $ | — |  |  |
Total | $ | 73,360 |  |  | $ | — |  |  | $ | — |  |  | $ | 73,360 |  |  | $ | 72,345 |  |  | $ | — |  |  | $ | 1,015 |  |  |
| December 31, 2019 |  |
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | Cash and Cash Equivalents |  | Short-Term Marketable Securities |  | Cash- Restricted |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash-unrestricted | $ | 16,614 |  |  | $ | — |  |  | $ | — |  |  | $ | 16,614 |  |  | $ | 16,614 |  |  | $ | — |  |  | $ | — |  |  |
Cash-restricted | 2,075 |  |  | — |  |  | — |  |  | 2,075 |  |  | — |  |  | — |  |  | 2,075 |  |  |
Total cash | $ | 18,689 |  |  | $ | — |  |  | $ | — |  |  | $ | 18,689 |  |  | $ | 16,614 |  |  | $ | — |  |  | $ | 2,075 |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 5,047 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,047 |  |  | $ | 5,047 |  |  | $ | — |  |  | $ | — |  |  |
US treasury securities | 36,942 |  |  | 36 |  |  | — |  |  | 36,978 |  |  | — |  |  | 36,978 |  |  | — |  |  |
Subtotal | $ | 41,989 |  |  | $ | 36 |  |  | $ | — |  |  | $ | 42,025 |  |  | $ | 5,047 |  |  | $ | 36,978 |  |  | $ | — |  |  |
Total | $ | 60,678 |  |  | $ | 36 |  |  | $ | — |  |  | $ | 60,714 |  |  | $ | 21,661 |  |  | $ | 36,978 |  |  | $ | 2,075 |  |  |
Schedule of debt | The carrying values of the components of the 2014 Notes and the 2019 Notes are as follows (in thousands):
|  | September 30, 2020 |  | December 31, 2019
2.75% 2014 Notes due 2034 |  |  |  |
Principal amount |  | $ | 1,079 |  |  | $ | 1,079 |
Unamortized debt discount |  | (17) |  |  | (18) |
Unamortized debt issuance cost |  | (4) |  |  | (4) |
|  | $ | 1,058 |  |  | $ | 1,057 |
5.25% 2019 Notes due 2024 |  |  |  |
Principal amount |  | $ | 55,000 |  |  | $ | 55,000 |
Unamortized debt issuance cost |  | (1,937) |  |  | (2,236) |
|  | $ | 53,063 |  |  | $ | 52,764 |
Net carrying value of all Notes |  | $ | 54,121 |  |  | $ | 53,821 |
The following table summarizes the par value, carrying value and the estimated fair value of the 2014 and 2019 Notes at September 30, 2020 and December 31, 2019, respectively (in thousands):
| September 30, 2020 |  | December 31, 2019
| Par Value |  | Carrying Value |  | Fair Value |  | Par Value |  | Carrying Value |  | Fair Value
2014 Notes | $ | 1,079 |  |  | $ | 1,058 |  |  | $ | 1,122 |  |  | $ | 1,079 |  |  | $ | 1,057 |  |  | $ | 1,122 |
2019 Notes | 55,000 |  |  | 53,063 |  |  | 143,039 |  |  | 55,000 |  |  | 52,764 |  |  | 73,975 |
Total | $ | 56,079 |  |  | $ | 54,121 |  |  | $ | 144,161 |  |  | $ | 56,079 |  |  | $ | 53,821 |  |  | $ | 75,097 |

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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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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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