|
Fair Value Measurements (Details) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
|
Sep. 30, 2014
|
Dec. 31, 2013
|
|
Fair Value [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
$ 54,748 |
$ 41,904 |
|
Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
7,445 |
5,774 |
|
Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
47,303 |
36,130 |
|
Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
0 |
0 |
|
Money Market Funds [Member] | Fair Value [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
7,445 |
5,774 |
|
Money Market Funds [Member] | Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
7,445 |
5,774 |
|
Money Market Funds [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
0 |
0 |
|
Money Market Funds [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
0 |
0 |
|
Commercial Paper [Member] | Fair Value [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
5,250 |
15,246 |
|
Commercial Paper [Member] | Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
0 |
0 |
|
Commercial Paper [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
5,250 |
15,246 |
|
Commercial Paper [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
0 |
0 |
|
Corporate Debt Securities [Member] | Fair Value [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
42,053 |
20,884 |
|
Corporate Debt Securities [Member] | Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
0 |
0 |
|
Corporate Debt Securities [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
42,053 |
20,884 |
|
Corporate Debt Securities [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total assets |
$ 0 |
$ 0 |