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Income Taxes - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]          
Accrued interest and penalties related to uncertain tax positions $ 0 $ 0 $ 0    
Operating loss carry-forwards 37,300,000 8,700,000 37,300,000 $ 10,600,000  
Tax reform, additional income tax benefit 100,000        
Tax reform, additional tax expense 5,900,000        
Tax reform, reduction of valuation allowance 5,900,000        
Net deferred tax liabilities 0 0 0    
(Benefit from) provision for income taxes   11,000 (115,000) 27,000  
Deferred tax assets, operating loss carry-forwards $ 8,610,000 10,793,000 $ 8,610,000 $ 9,239,000  
Operating loss carry-forwards, subject to expiration   54,200,000      
Scenario, forecast          
Operating Loss Carryforwards [Line Items]          
Deferred tax assets, operating loss carry-forwards         $ 46,000,000
Research tax credit carry-forward          
Operating Loss Carryforwards [Line Items]          
Net operating loss carry-forwards   300,000      
Domestic tax authority          
Operating Loss Carryforwards [Line Items]          
Operating loss carry-forwards   100,500,000      
Deferred tax assets, operating loss carry-forwards   $ 46,000,000