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Investments | 9 Months Ended
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Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Investments |
3) | 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.
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 |
The tables above, which show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments as of September 30, 2017 and December 31, 2016, reflect the inclusion within short-term investments of investments with contractual maturities greater than one year from the date of purchase. Management has the ability, if necessary, to liquidate any of its investments in order to meet the Company’s liquidity needs in the next 12 months. Accordingly, those investments with contractual maturities greater than one year from the date of purchase are classified as short-term on the accompanying balance sheets. The Company reviews and evaluates its investments for any indication of possible impairment. Based on this review, the Company has determined that the unrealized losses related to these investments at September 30, 2017 and December 31, 2017, were temporary. Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method. Realized gains or losses are reflected in income and were not material for the three and nine months ended September 30, 2017 and 2016.

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