| Summary of available-for-sale debt securities recognized as cash and cash equivalents, marketable securities, or restricted cash |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
September 30, 2012 |
|
| |
|
Amortized |
|
|
Unrealized |
|
|
Unrealized |
|
|
Estimated |
|
| |
|
Cost |
|
|
Gains |
|
|
Losses |
|
|
Fair Value |
|
|
Certificates of deposit
|
|
$ |
200 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
200 |
|
|
Money market funds
|
|
|
27,517 |
|
|
|
— |
|
|
|
— |
|
|
|
27,517 |
|
|
U.S. Treasury securities
|
|
|
70,674 |
|
|
|
6 |
|
|
|
— |
|
|
|
70,680 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
$ |
98,391 |
|
|
$ |
6 |
|
|
$ |
— |
|
|
$ |
98,397 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
| |
|
December 31, 2011 |
|
| |
|
Amortized |
|
|
Unrealized |
|
|
Unrealized |
|
|
Estimated |
|
| |
|
Cost |
|
|
Gains |
|
|
Losses |
|
|
Fair Value |
|
|
Certificates of deposit
|
|
$ |
200 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
200 |
|
|
Money market funds
|
|
|
9,238 |
|
|
|
— |
|
|
|
— |
|
|
|
9,238 |
|
|
U.S. Treasury securities
|
|
|
51,674 |
|
|
|
29 |
|
|
|
— |
|
|
|
51,703 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
$ |
61,112 |
|
|
$ |
29 |
|
|
$ |
— |
|
|
$ |
61,141 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Classification of the available-for-sale securities |
| |
|
|
|
|
|
|
|
|
| |
|
September 30, 2012 |
|
|
December 31, 2011 |
|
|
Cash and cash equivalents
|
|
$ |
69,563 |
|
|
$ |
9,238 |
|
|
Marketable securities
|
|
|
28,634 |
|
|
|
51,703 |
|
|
Restricted cash
|
|
|
200 |
|
|
|
200 |
|
| |
|
|
|
|
|
|
|
|
| |
|
$ |
98,397 |
|
|
$ |
61,141 |
|
| |
|
|
|
|
|
|
|
|
|