Note M - Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|---|
| Net operating loss carryforwards | $ 44,984 | $ 26,617 | $ 16,390 |
| Research and development tax carryforward | 3,166 | 2,254 | 1,793 |
| Compensation | 715 | 232 | 83 |
| Total gross deferred tax assets | 48,865 | 29,103 | 18,266 |
| Property and equipment | 89 | 80 | 170 |
| Total gross deferred tax liabilities | 89 | 80 | 170 |
| Deferred tax assets less liabilities | 48,776 | 29,023 | 18,096 |
| Valuation allowance | (48,776) | (29,023) | (18,096) |
| Net deferred tax asset (liability) |