|
Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Deferred tax assets: | ||
| Net operating loss federal state | $ 15,411 | $ 12,515 |
| Research credits | 8,727 | 5,810 |
| Accrued compensation and vacation | 595 | 1,201 |
| Deferred revenue, other accruals and reserves | 2,188 | 574 |
| Stock compensation | 3,262 | 1,822 |
| Patents | 5,929 | 8,118 |
| Gross deferred tax assets | 36,112 | 30,040 |
| Valuation allowance | (35,496) | (29,199) |
| Total deferred tax asset | 616 | 841 |
| Deferred tax liabilities: | ||
| Property and equipment | 616 | 841 |
| Total deferred tax liabilities | 616 | 841 |
| Net deferred tax assets | $ 0 | $ 0 |