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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Concentration Risk [Line Items]                
Income tax expense $ 634,000 $ 0 $ 0 $ 0 $ 634,000 $ 0    
Effective tax rate (percentage)   0.00%   0.00% 7.23% 0.00%    
Uncertain tax positions 0       $ 0      
Right of use asset - operating lease 4,421,000       4,421,000   $ 4,452,000  
Lease liabilities - operating lease 5,243,000       5,243,000      
Lease liability, current - operating lease 186,000       186,000   111,000  
Deferred rent - current               $ 150,000
Lease liability, operating lease $ 5,057,000       $ 5,057,000   5,156,000  
Deferred rent - long term               $ 665,000
Accounting Standards Update 2016-02                
Concentration Risk [Line Items]                
Right of use asset - operating lease             4,452,000  
Lease liabilities - operating lease             5,300,000  
Lease liability, current - operating lease             111,000  
Deferred rent - current             (150,000)  
Lease liability, operating lease             5,156,000  
Deferred rent - long term             $ (665,000)  
License And Development Service Revenue | Revenue from Contract with Customer Benchmark | Collaboration Partner Concentration Risk                
Concentration Risk [Line Items]                
Concentration risk (percentage) 100.00%       100.00%