Financial Instruments (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2015 |
Sep. 30, 2015 |
Dec. 31, 2014 |
| Foreign Exchange Contract |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets related to derivative instruments |
$ 0
|
$ 0
|
|
| Liabilities related to derivative instruments |
0
|
0
|
|
| Notional principal amount of foreign exchange contracts |
6,900
|
6,900
|
|
| Foreign Exchange Contract | Other Income Expense | Not Designated as Hedging Instrument |
|
|
|
| Fair Value Measurements |
|
|
|
| Foreign exchange contracts |
418
|
$ 318
|
|
| Minimum |
|
|
|
| Fair Value Measurements |
|
|
|
| Maturity period of long-term investments |
|
1 year
|
|
| Maximum |
|
|
|
| Fair Value Measurements |
|
|
|
| Maturity period of long-term investments |
|
2 years
|
|
| Level 1 |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
7,081
|
$ 7,081
|
|
| Assets, Unrealized Gains |
3
|
3
|
|
| Assets, Fair Value |
7,084
|
7,084
|
|
| Level 1 | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
6,083
|
6,083
|
|
| Level 1 | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
1,001
|
1,001
|
|
| Level 1 | Money market funds |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
6,083
|
6,083
|
|
| Assets, Fair Value |
6,083
|
6,083
|
|
| Level 1 | Money market funds | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
6,083
|
6,083
|
|
| Level 1 | U.S. government notes |
|
|
|
| Fair Value Measurements |
|
|
|
| Adjusted cost, Available-for-sale investments |
998
|
998
|
|
| Unrealized Gains, available-for-sale investments |
3
|
3
|
|
| Fair value, Available-for-sale investments |
1,001
|
1,001
|
|
| Level 1 | U.S. government notes | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
1,001
|
1,001
|
|
| Level 2 | Available-for-sale investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Adjusted cost, Available-for-sale investments |
66,323
|
66,323
|
|
| Unrealized Gains, available-for-sale investments |
29
|
29
|
|
| Unrealized Losses, available-for-sale investments |
(14)
|
(14)
|
|
| Fair value, Available-for-sale investments |
66,338
|
66,338
|
|
| Level 2 | Available-for-sale investments | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
1,700
|
1,700
|
|
| Level 2 | Available-for-sale investments | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
43,977
|
43,977
|
|
| Level 2 | Available-for-sale investments | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
20,661
|
20,661
|
|
| Level 2 | Asset-backed securities |
|
|
|
| Fair Value Measurements |
|
|
|
| Adjusted cost, Available-for-sale investments |
8,099
|
8,099
|
|
| Unrealized Gains, available-for-sale investments |
8
|
8
|
|
| Fair value, Available-for-sale investments |
8,107
|
8,107
|
|
| Level 2 | Asset-backed securities | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
8,107
|
8,107
|
|
| Level 2 | Corporate bonds |
|
|
|
| Fair Value Measurements |
|
|
|
| Adjusted cost, Available-for-sale investments |
49,368
|
49,368
|
|
| Unrealized Gains, available-for-sale investments |
17
|
17
|
|
| Unrealized Losses, available-for-sale investments |
(14)
|
(14)
|
|
| Fair value, Available-for-sale investments |
49,371
|
49,371
|
|
| Level 2 | Corporate bonds | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
37,825
|
37,825
|
|
| Level 2 | Corporate bonds | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
11,546
|
11,546
|
|
| Level 2 | Commercial paper |
|
|
|
| Fair Value Measurements |
|
|
|
| Adjusted cost, Available-for-sale investments |
5,349
|
5,349
|
|
| Fair value, Available-for-sale investments |
5,349
|
5,349
|
|
| Level 2 | Commercial paper | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
1,700
|
1,700
|
|
| Level 2 | Commercial paper | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
3,649
|
3,649
|
|
| Level 2 | U.S. agency securities |
|
|
|
| Fair Value Measurements |
|
|
|
| Adjusted cost, Available-for-sale investments |
3,507
|
3,507
|
|
| Unrealized Gains, available-for-sale investments |
4
|
4
|
|
| Fair value, Available-for-sale investments |
3,511
|
3,511
|
|
| Level 2 | U.S. agency securities | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
2,503
|
2,503
|
|
| Level 2 | U.S. agency securities | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Fair value, Available-for-sale investments |
1,008
|
1,008
|
|
| Measured on a recurring basis |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
84,358
|
84,358
|
$ 97,266
|
| Assets, Unrealized Gains |
32
|
32
|
2
|
| Assets, Unrealized Losses |
(14)
|
(14)
|
(49)
|
| Assets, Fair Value |
84,376
|
84,376
|
97,219
|
| Measured on a recurring basis | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
18,737
|
18,737
|
29,187
|
| Measured on a recurring basis | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
43,977
|
43,977
|
53,523
|
| Measured on a recurring basis | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
21,662
|
21,662
|
14,509
|
| Measured on a recurring basis | Cash |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
10,954
|
10,954
|
13,077
|
| Assets, Fair Value |
10,954
|
10,954
|
13,077
|
| Measured on a recurring basis | Cash | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
$ 10,954
|
$ 10,954
|
13,077
|
| Measured on a recurring basis | Level 1 |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
|
|
16,110
|
| Assets, Fair Value |
|
|
16,110
|
| Measured on a recurring basis | Level 1 | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
16,110
|
| Measured on a recurring basis | Level 1 | Money market funds |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
|
|
16,110
|
| Assets, Fair Value |
|
|
16,110
|
| Measured on a recurring basis | Level 1 | Money market funds | Cash and Cash Equivalents |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
16,110
|
| Measured on a recurring basis | Level 2 |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
|
|
68,079
|
| Assets, Unrealized Gains |
|
|
2
|
| Assets, Unrealized Losses |
|
|
(49)
|
| Assets, Fair Value |
|
|
68,032
|
| Measured on a recurring basis | Level 2 | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
53,523
|
| Measured on a recurring basis | Level 2 | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
14,509
|
| Measured on a recurring basis | Level 2 | Asset-backed securities |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
|
|
4,458
|
| Assets, Unrealized Losses |
|
|
(3)
|
| Assets, Fair Value |
|
|
4,455
|
| Measured on a recurring basis | Level 2 | Asset-backed securities | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
4,455
|
| Measured on a recurring basis | Level 2 | Corporate bonds |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
|
|
54,321
|
| Assets, Unrealized Gains |
|
|
2
|
| Assets, Unrealized Losses |
|
|
(46)
|
| Assets, Fair Value |
|
|
54,277
|
| Measured on a recurring basis | Level 2 | Corporate bonds | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
46,726
|
| Measured on a recurring basis | Level 2 | Corporate bonds | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
7,551
|
| Measured on a recurring basis | Level 2 | Commercial paper |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
|
|
6,797
|
| Assets, Fair Value |
|
|
6,797
|
| Measured on a recurring basis | Level 2 | Commercial paper | Short-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
6,797
|
| Measured on a recurring basis | Level 2 | U.S. agency securities |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Adjusted Cost |
|
|
2,503
|
| Assets, Fair Value |
|
|
2,503
|
| Measured on a recurring basis | Level 2 | U.S. agency securities | Long-term investments |
|
|
|
| Fair Value Measurements |
|
|
|
| Assets, Fair Value |
|
|
$ 2,503
|