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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Carried at Fair Value on Recurring Basis | The following tables set forth the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as follows (in thousands):
|  | Fair Value Measurements at December 31, 2018 Using |
|  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term equity securities |  | $ | — |  |  | $ | — |  |  | $ | 392 |  |  | $ | 392 |
|  | Fair Value Measurements at December 31, 2017 Using |
|  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 34,907 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,907 |
(1) Included in cash and cash equivalents
Summary of Changes in Estimated Fair Value of Level 3 Financial Assets | The following table provides a summary of changes in the estimated fair value of the Company’s Level 3 financial assets for the year ended December 31, 2018 (in thousands):
Balance at December 31, 2017 |  | $ | — |
Fair value of long-term equity securities at contract inception |  |  | 955 |
Change in fair value |  |  | (563 | )
Balance at December 31, 2018 |  | $ | 392 |
Estimated Fair Value of Equity Securities Assumptions | The estimated fair value of the equity securities was calculated based on the following assumptions as of December 31, 2018 and the contract inception date of April 3, 2018:
|  | December 31, |  |  | April 3, |
|  | 2018 |  |  | 2018 |
Discount for lack of marketability |  |  | 35 | % |  |  | 30 | %
Estimated time to liquidity of shares |  | 1.45 years |  |  | 1.45 years |
Scenario probabilities |  |  |  |  |  |  |  |
Liquidation |  |  | 20 | % |  |  | 65 | %
Near-term sale |  |  | 5 | % |  |  | 5 | %
Near-term financing |  |  | 75 | % |  |  | 30 | %
Outstanding Long Term Debt Carrying Amount and Estimated Fair Value | The carrying amount and the estimated fair value of the Company’s outstanding long-term debt at December 31, 2018 and December 31, 2017, are as follows (in thousands):
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Novartis note |  | $ | 15,193 |  |  | $ | 14,825 |  |  | $ | 14,572 |  |  | $ | 14,178 |
SVB Loan |  |  | 7,286 |  |  |  | 7,281 |  |  |  | — |  |  |  | — |
Total |  | $ | 22,479 |  |  | $ | 22,106 |  |  | $ | 14,572 |  |  | $ | 14,178 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition Fair value assets measured on estimated fair value of equity securities assumptions. + References No definition available. + Details
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