|
Component of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Deferred tax assets: | ||
| Net operating loss carry forwards | $ 147,655 | $ 127,529 |
| Research tax credit carry forwards | 21,336 | 18,163 |
| Accruals and reserves | 9,501 | 8,529 |
| Capitalized research costs | 10,662 | 12,757 |
| Deferred revenue | 2,486 | 2,180 |
| Other | 1,222 | 1,221 |
| Deferred Tax Assets, Gross, Total | 192,862 | 170,379 |
| Less valuation allowance | (192,733) | (170,232) |
| Total deferred tax assets | 129 | 147 |
| Deferred tax liabilities: | ||
| Fixed Assets | (162) | (86) |
| Other | 33 | (61) |
| Total deferred tax liabilities | (129) | (147) |
| Net deferred tax assets |