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Investments (Tables) | 9 Months Ended
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Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments | The fair value of investments classified as short-term consists of the following:
|  | September 30, 2017 |  |  | December 31, 2016 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 21,503 |  |  | $ | 23,818 |
Bankers’ acceptance drafts |  |  | 3,452 |  |  |  | 1,439 |
Asset-backed securities |  |  | 39,702 |  |  |  | 36,809 |
Commercial paper |  |  | 21,215 |  |  |  | 24,381 |
Corporate obligations |  |  | 80,099 |  |  |  | 46,707 |
Municipal bonds |  |  | 45 |  |  |  | 591 |
Promissory note |  |  | 1,075 |  |  |  | 675 |
U.S. treasury obligations |  |  | 25,777 |  |  |  | 25,414 |
U.S. agency obligations |  |  | 35,763 |  |  |  | 29,629 |
|  | $ | 228,631 |  |  | $ | 189,463 |
Investments classified as long-term consists of the following:
|  | September 30, 2017 |  |  | December 31, 2016 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,193 |  |  | $ | 5,558 |
Cost method investments: |  |  |  |  |  |  |  |
Minority interest in a private company(1) |  |  | 4,400 |  |  |  | 4,300 |
|  | $ | 10,593 |  |  | $ | 9,858 |
(1) | In April 2016, the Company invested $9,300 for a minority interest in a private company. For the year ended December 31, 2016, the Company recognized $5,000 of impairment charges related to this cost method investment. In July 2017, the Company invested an additional $100 in this private company.
Gross Unrealized Gains and (Losses) Aggregated by Investment Category | The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of September 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 21,501 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 21,503 |
Bankers’ acceptance drafts |  |  | 3,452 |  |  |  | — |  |  |  | — |  |  |  | 3,452 |
Asset-backed securities |  |  | 39,709 |  |  |  | 17 |  |  |  | (24 | ) |  |  | 39,702 |
Commercial paper |  |  | 21,278 |  |  |  | — |  |  |  | (63 | ) |  |  | 21,215 |
Corporate obligations |  |  | 80,020 |  |  |  | 87 |  |  |  | (8 | ) |  |  | 80,099 |
Municipal bonds |  |  | 45 |  |  |  | — |  |  |  | — |  |  |  | 45 |
Promissory note |  |  | 1,075 |  |  |  | — |  |  |  | — |  |  |  | 1,075 |
U.S. treasury obligations |  |  | 25,756 |  |  |  | 21 |  |  |  | — |  |  |  | 25,777 |
U.S. agency obligations |  |  | 35,756 |  |  |  | 10 |  |  |  | (3 | ) |  |  | 35,763 |
|  | $ | 228,592 |  |  | $ | 137 |  |  | $ | (98 | ) |  | $ | 228,631 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of September 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,193 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,193 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 23,818 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,818 |
Bankers acceptance drafts |  |  | 1,439 |  |  |  | — |  |  |  | — |  |  |  | 1,439 |
Asset-backed securities |  |  | 36,847 |  |  |  | 6 |  |  |  | (44 | ) |  |  | 36,809 |
Commercial paper |  |  | 24,423 |  |  |  | — |  |  |  | (42 | ) |  |  | 24,381 |
Corporate obligations |  |  | 46,700 |  |  |  | 21 |  |  |  | (14 | ) |  |  | 46,707 |
Municipal bonds |  |  | 591 |  |  |  | — |  |  |  | — |  |  |  | 591 |
Promissory note |  |  | 675 |  |  |  | — |  |  |  | — |  |  |  | 675 |
U.S. treasury obligations |  |  | 25,414 |  |  |  | — |  |  |  | — |  |  |  | 25,414 |
U.S. agency obligations |  |  | 29,631 |  |  |  | 8 |  |  |  | (10 | ) |  |  | 29,629 |
|  | $ | 189,538 |  |  | $ | 35 |  |  | $ | (110 | ) |  | $ | 189,463 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,276 |  |  | $ | — |  |  | $ | (718 | ) |  | $ | 5,558 |

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