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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Net operating losses $ 34,938 $ 13,054
Capitalized license 771 835
Research credits 4,151 1,007
Accruals 401 514
Stock-based compensation 53 51
Net unrealized loss   11
Total gross deferred tax assets 40,314 15,472
Less valuation allowance (40,221) (15,395)
Total deferred tax assets 93 77
Deferred tax liabilities:    
Net unrealized gain 13  
Depreciation and amortization 80 77
Total gross deferred tax liability 93 77
Net deferred tax assets $ 0 $ 0