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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at December 31, 2015 and 2014 were as follows:
| Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
December 31, 2015 |  |  |  |  |  |  |
| Available-for-sale securities: |  |  |  |  |  |  |
|  | Corporate bonds and notes | $ | 20,827 |  |  | $ | 50 |  |  | $ | (133 | ) |  | $ | 20,744 |
|  | Municipal bonds | 5,608 |  |  | 18 |  |  | (5 | ) |  | 5,621 |
| Total available-for-sale securities | $ | 26,435 |  |  | $ | 68 |  |  | $ | (138 | ) |  | $ | 26,365 |
| Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
December 31, 2014 |  |  |  |  |  |  |
| Available-for-sale securities: |  |  |  |  |  |  |
|  | Corporate bonds and notes | $ | 19,804 |  |  | $ | 89 |  |  | $ | (55 | ) |  | $ | 19,838 |
|  | Municipal bonds | 6,292 |  |  | 28 |  |  | (2 | ) |  | 6,318 |
| Total available-for-sale securities | $ | 26,096 |  |  | $ | 117 |  |  | $ | (57 | ) |  | $ | 26,156 |
Marketable Securities | Maturities of marketable securities classified as available-for-sale securities were as follows at December 31, 2015:
| Amortized cost |  | Estimated fair value
| Due within one year | $ | 7,179 |  |  | $ | 7,161 |
| Due after one year through five years | 19,256 |  |  | 19,204 |
| Due after five years through ten years | — |  |  | — |
Total available-for-sale securities | $ | 26,435 |  |  | $ | 26,365 |
Available-for-sale Marketable Securities | The available-for-sale marketable securities in a gross unrealized loss position as of December 31, 2015 are summarized as follows:
| Less than 12 months |  | More than 12 months |  | Total
| Estimated fair value |  | Gross unrealized holding losses |  | Estimated fair value |  | Gross unrealized holding losses |  | Estimated fair value |  | Gross unrealized holding losses
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes | $ | 10,256 |  |  | $ | (88 | ) |  | $ | 3,298 |  |  | $ | (45 | ) |  | $ | 13,554 |  |  | $ | (133 | )
Municipal bonds | 1,674 |  |  | (4 | ) |  | 640 |  |  | (1 | ) |  | 2,314 |  |  | (5 | )
| $ | 11,930 |  |  | $ | (92 | ) |  | $ | 3,938 |  |  | $ | (46 | ) |  | $ | 15,868 |  |  | $ | (138 | )

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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