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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Capitalized research expense $ 7,408,000 $ 8,546,000
Net operating loss carryforwards 89,399,000 71,665,000
Research and development and other tax credits 9,432,000 7,531,000
Deferred revenue 985,000 297,000
Deferred rent 2,013,000 2,097,000
Stock-based compensation 3,408,000 3,091,000
Acquired intangibles 912,000 858,000
Other 2,693,000 1,906,000
Deferred tax assets, gross 116,250,000 95,991,000
Valuation allowance (115,007,000) (94,039,000)
Total deferred tax assets 1,243,000 1,952,000
Deferred tax liabilities:    
Acquired intangibles (142,000) (124,000)
Investment in affiliated entity (4,000) (422,000)
Fixed assets (1,121,000) (1,430,000)
Net deferred tax liabilities $ (24,000) $ (24,000)