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Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | $ 3,440
Gross unrealized gains |  | 4,954
Gross unrealized losses |  | 0
Estimated fair value |  | 8,394
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 97,891 | 2,179
Gross unrealized gains | 4,944 | 4,954
Gross unrealized losses | (44) | 0
Estimated fair value | 102,791 | 7,133
Bank Deposits |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 43,043 |
Gross unrealized gains | 0 |
Gross unrealized losses | (4) |
Estimated fair value | 43,039 |
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 41,238 |
Gross unrealized gains | 0 |
Gross unrealized losses | (35) |
Estimated fair value | 41,203 |
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1,747 |
Gross unrealized gains | 0 |
Gross unrealized losses | 0 |
Estimated fair value | 1,747 |
Asset-backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 10,020 |
Gross unrealized gains | 0 |
Gross unrealized losses | (5) |
Estimated fair value | 10,015 |
Corporate Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1,843 |
Gross unrealized gains | 4,944 |
Gross unrealized losses | 0 |
Estimated fair value | $ 6,787 |
Certificates of Deposit - Restricted |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 1,261
Gross unrealized gains |  | 0
Gross unrealized losses |  | 0
Estimated fair value |  | $ 1,261

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