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Income Taxes - Reconciliation of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Net operating loss carryforwards $ 15,287 $ 18,937  
Research and development tax credits 419 313  
Accruals, reserves and other 590 1,394  
Interest expense 744 691  
Basis differences in fixed and intangible assets 225 230  
Total gross deferred tax assets 17,265 21,565  
Less: Valuation allowance (16,797) (21,138) $ (19,929)
Deferred tax assets, net 468 427  
Deferred tax liabilities:      
Financing and acquisition-related liabilities (336) (338)  
Indefinite lived assets (396) (334)  
Deferred tax liabilities, net (732) (672)  
Net deferred tax liabilities $ (264) $ (245)