v3.8.0.1

Note 18 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accruals and other | $ 2,717 | $ 3,746
Research credits | 6,530 | 5,670
Net operating loss carryforward | 31,064 | 36,224
Section 59(e) R&D expenditures | 12,156 | 16,782
Deferred revenue | 18,384 | 24,836
AMT credit |  | 703
Total deferred tax assets | 70,851 | 87,961
Valuation allowance | (70,851) | (87,961)
Net deferred tax assets |  | $ 0

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