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Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Summary of Investments Measured at Fair Value on Recurring Basis | The following table summarizes the Company’s investments at September 30, 2019 and December 31, 2018 measured at fair value on a recurring basis (in thousands):
|  | September 30, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |
|  |  |  |  |  | Unrealized |  |  |  |  |  |  |  |  |  |  | Unrealized |  |  |  |  |
|  |  |  |  |  | Gains |  |  | Recorded |  |  |  |  |  |  | Gains |  |  | Recorded |
|  | Cost |  |  | (Losses) |  |  | Basis |  |  | Cost |  |  | (Losses) |  |  | Basis |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 6,121 |  |  | $ | — |  |  | $ | 6,121 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 30 |
Total cash equivalents |  |  | 6,121 |  |  |  | — |  |  |  | 6,121 |  |  |  | 30 |  |  |  | — |  |  |  | 30 |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 70,922 |  |  |  | 36 |  |  |  | 70,958 |  |  |  | 20 |  |  |  | — |  |  |  | 20 |
U.S. treasuries |  |  | 18,642 |  |  |  | (27 | ) |  |  | 18,615 |  |  |  | 347 |  |  |  | — |  |  |  | 347 |
U.S. government agency securities |  |  | 8,910 |  |  |  | 313 |  |  |  | 9,223 |  |  |  | 50 |  |  |  | (1 | ) |  |  | 49 |
Mortgage backed securities |  |  | 2,943 |  |  |  | (8 | ) |  |  | 2,935 |  |  |  | — |  |  |  | — |  |  |  | — |
Asset backed securities |  |  | 17 |  |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | — |
Total current investments |  |  | 101,434 |  |  |  | 314 |  |  |  | 101,748 |  |  |  | 417 |  |  |  | (1 | ) |  |  | 416 |
Long term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 794 |  |  |  | (3 | ) |  |  | 791 |
Mortgage backed securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 484 |  |  |  | (13 | ) |  |  | 471 |
Corporate bonds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 422 |  |  |  | (7 | ) |  |  | 415 |
Asset backed securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |
Total long term investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,710 |  |  |  | (23 | ) |  |  | 1,687 |
Restricted cash and investments (1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 101,533 |  |  |  | 1,793 |  |  |  | 103,326 |  |  |  | 185,116 |  |  |  | (3,739 | ) |  |  | 181,377 |
Mortgage backed securities |  |  | 66,012 |  |  |  | 507 |  |  |  | 66,519 |  |  |  | 89,426 |  |  |  | (2,026 | ) |  |  | 87,400 |
U.S. government agency securities |  |  | 29,780 |  |  |  | 947 |  |  |  | 30,727 |  |  |  | 45,548 |  |  |  | (908 | ) |  |  | 44,640 |
Money market funds |  |  | 19,085 |  |  |  | (2 | ) |  |  | 19,083 |  |  |  | 419 |  |  |  | — |  |  |  | 419 |
U.S. treasuries |  |  | 18,397 |  |  |  | 24 |  |  |  | 18,421 |  |  |  | 44,304 |  |  |  | (283 | ) |  |  | 44,021 |
Supranational bonds |  |  | 4,769 |  |  |  | 33 |  |  |  | 4,802 |  |  |  | 4,765 |  |  |  | (24 | ) |  |  | 4,741 |
Mutual funds |  |  | 2,844 |  |  |  | — |  |  |  | 2,844 |  |  |  | 1,093 |  |  |  | — |  |  |  | 1,093 |
Asset backed securities |  |  | 116 |  |  |  | 1 |  |  |  | 117 |  |  |  | 75 |  |  |  | (1 | ) |  |  | 74 |
Municipal bonds |  |  | 50 |  |  |  | — |  |  |  | 50 |  |  |  | 50 |  |  |  | — |  |  |  | 50 |
Total restricted cash and investments |  |  | 242,586 |  |  |  | 3,303 |  |  |  | 245,889 |  |  |  | 370,796 |  |  |  | (6,981 | ) |  |  | 363,815 |
Total investments |  | $ | 350,141 |  |  | $ | 3,617 |  |  | $ | 353,758 |  |  | $ | 372,953 |  |  | $ | (7,005 | ) |  | $ | 365,948 |
(1) Included in restricted cash and investments within the condensed consolidated balance sheet is restricted cash of $173.7 million and $104.5 million as of September 30, 2019 and December 31, 2018, respectively, which is excluded from the table above. Restricted cash and investments are classified as current and noncurrent on the balance sheet based on the nature of the restriction.
Summary of Assets Measured at Fair Value on Recurring Basis | The following table summarizes the Company’s investments at September 30, 2019 and December 31, 2018 measured at fair value on a recurring basis by fair value hierarchy level (in thousands):
|  | September 30, 2019 |  |  | December 31, 2018 |
|  | Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Recorded |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Recorded |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Basis |  |  | Level 1 |  |  | Level 2 |  |  | Other (1) |  |  | Basis |  |  | Level 1 |  |  | Level 2 |  |  | Other (1) |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 6,121 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,121 |  |  | $ | 30 |  |  | $ | — |  |  | $ | — |  |  | $ | 30 |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 70,958 |  |  |  | — |  |  |  | 70,958 |  |  |  | — |  |  |  | 435 |  |  |  | — |  |  |  | 435 |  |  |  | — |
U.S. treasuries |  |  | 18,615 |  |  |  | — |  |  |  | 18,615 |  |  |  | — |  |  |  | 1,138 |  |  |  | — |  |  |  | 1,138 |  |  |  | — |
U.S. government agency securities |  |  | 9,223 |  |  |  | — |  |  |  | 9,223 |  |  |  | — |  |  |  | 49 |  |  |  | — |  |  |  | 49 |  |  |  | — |
Mortgage backed securities |  |  | 2,935 |  |  |  | — |  |  |  | 2,935 |  |  |  | — |  |  |  | 471 |  |  |  | — |  |  |  | 471 |  |  |  | — |
Asset backed securities |  |  | 17 |  |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |  |  |  | — |
Restricted cash and investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 103,326 |  |  |  | — |  |  |  | 103,326 |  |  |  | — |  |  |  | 181,377 |  |  |  | — |  |  |  | 181,377 |  |  |  | — |
Mortgage backed securities |  |  | 66,519 |  |  |  | — |  |  |  | 66,519 |  |  |  | — |  |  |  | 87,400 |  |  |  | — |  |  |  | 87,400 |  |  |  | — |
U.S. government agency securities |  |  | 30,727 |  |  |  | — |  |  |  | 30,727 |  |  |  | — |  |  |  | 44,640 |  |  |  | — |  |  |  | 44,640 |  |  |  | — |
Money market funds |  |  | 19,083 |  |  |  | — |  |  |  | — |  |  |  | 19,083 |  |  |  | 419 |  |  |  | — |  |  |  | — |  |  |  | 419 |
U.S. treasuries |  |  | 18,421 |  |  |  | — |  |  |  | 18,421 |  |  |  | — |  |  |  | 44,021 |  |  |  | — |  |  |  | 44,021 |  |  |  | — |
Supranational bonds |  |  | 4,802 |  |  |  | — |  |  |  | 4,802 |  |  |  | — |  |  |  | 4,741 |  |  |  | — |  |  |  | 4,741 |  |  |  | — |
Mutual funds |  |  | 2,844 |  |  |  | 2,844 |  |  |  | — |  |  |  | — |  |  |  | 1,093 |  |  |  | 1,093 |  |  |  | — |  |  |  | — |
Asset backed securities |  |  | 117 |  |  |  | — |  |  |  | 117 |  |  |  | — |  |  |  | 74 |  |  |  | — |  |  |  | 74 |  |  |  | — |
Municipal bonds |  |  | 50 |  |  |  | — |  |  |  | 50 |  |  |  | — |  |  |  | 50 |  |  |  | — |  |  |  | 50 |  |  |  | — |
Total investments |  | $ | 353,758 |  |  | $ | 2,844 |  |  | $ | 325,710 |  |  | $ | 25,204 |  |  | $ | 365,948 |  |  | $ | 1,093 |  |  | $ | 364,406 |  |  | $ | 449 |
(1) Investments in money market funds measured at fair value using the net asset value per share practical expedient are not subject to hierarchy level classification disclosure. The Company invests in money market funds that seek to maintain a stable net asset value. These investments include commingled funds that comprise high-quality short-term securities representing liquid debt and monetary instruments where the redemption value is likely to be the fair value. Redemption is permitted daily without written notice.
Summary of Contractual Maturities of Available for Sale Securities | The following table summarizes the contractual maturities of the Company’s available for sale securities at September 30, 2019. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.
| September 30, 2019 |
(In thousands) | Less than 1 Year |  |  | Between 1 to 5 Years |  |  | Between 5 to 10 Years |  |  | After 10 Years |  |  | Total |
Corporate bonds | $ | 30,040 |  |  | $ | 122,786 |  |  | $ | 21,458 |  |  | $ | — |  |  | $ | 174,284 |
U.S. government agency securities |  | 5,499 |  |  |  | 6,443 |  |  |  | 28,008 |  |  |  | — |  |  | $ | 39,950 |
U.S. treasuries |  | 36,232 |  |  |  | 804 |  |  |  | — |  |  |  | — |  |  | $ | 37,036 |
Money market funds |  | 25,204 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | $ | 25,204 |
Supranational bonds |  | — |  |  |  | 4,802 |  |  |  | — |  |  |  | — |  |  | $ | 4,802 |
Asset backed securities |  | — |  |  |  | 134 |  |  |  | — |  |  |  | — |  |  | $ | 134 |
Municipal bonds |  | 50 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | $ | 50 |
Total | $ | 97,025 |  |  | $ | 134,969 |  |  | $ | 49,466 |  |  | $ | - |  |  | $ | 281,460 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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