|
Balance Sheet Components (Available For Sale Investments) (Details) (USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2014
|
Dec. 31, 2013
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
|
$ 31,676 |
| Unrealized Gains |
|
14 |
| Unrealized Losses |
|
(10) |
| Estimated Fair Value |
|
31,680 |
|
Short-term investments [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
32,702 |
30,162 |
| Unrealized Gains |
10 |
14 |
| Unrealized Losses |
(5) |
(9) |
| Estimated Fair Value |
32,707 |
30,167 |
|
Short-term investments [Member] | Commercial Paper [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
12,488 |
15,232 |
| Unrealized Gains |
10 |
14 |
| Unrealized Losses |
0 |
0 |
| Estimated Fair Value |
12,498 |
15,246 |
|
Short-term investments [Member] | Corporate Debt Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
20,214 |
14,930 |
| Unrealized Gains |
0 |
0 |
| Unrealized Losses |
(5) |
(9) |
| Estimated Fair Value |
20,209 |
14,921 |
|
Long-term investments [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
|
1,514 |
| Unrealized Gains |
|
0 |
| Unrealized Losses |
|
(1) |
| Estimated Fair Value |
|
1,513 |
|
Long-term investments [Member] | Corporate Debt Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost |
|
1,514 |
| Unrealized Gains |
|
0 |
| Unrealized Losses |
|
(1) |
| Estimated Fair Value |
|
$ 1,513 |