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Income Taxes Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Capitalized research expense $ 6,300 $ 7,408
NOL carryforwards 110,788 89,399
Research and development and other tax credits 11,737 9,432
Deferred revenue 1,506 985
Deferred rent 0 2,013
Stock-based compensation 3,255 3,408
Acquired intangibles 889 912
Derivative liability 1,852 0
Interest expense 1,122 0
Investment in affiliated entity 645 0
Lease liability 4,722 0
Other 2,413 2,693
Deferred tax assets, gross 145,229 116,250
Valuation allowance (137,159) (115,007)
Total deferred tax assets 8,070 1,243
Deferred tax liabilities:    
Acquired intangibles (160) (142)
Investment in affiliated entity 0 (4)
Right of use asset (2,894) 0
Note discount (2,862) 0
Convertible note (1,381) 0
Fixed assets (805) (1,121)
Net deferred tax liabilities $ (32) $ (24)