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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets [Abstract]    
Accounts receivable $ 126 $ 16
Inventory 69 120
Accrued expenses 835 15
NOL carryforwards 23,687 10,899
Interest limitation imposed by the TJCA 5,748 2,124
Stock Compensation 2,505 1,224
Other 783 260
Property and equipment 1,741 1,380
Orphan Drug and R&D Tax Credits 4,621 3,917
Deferred tax assets 40,115 19,955
Deferred tax liabilities [Abstract]    
Intangible assets (58) (39)
Prepaid expenses 0 (407)
Deferred tax liabilities (58) (446)
Valuation Allowance (40,057) (19,509)
Net deferred tax asset/(liability) 0 0
Unrecognized Tax Benefits [Abstract]    
Unrecognized tax benefits 0 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]    
Penalties and interest accrued $ 0 $ 0
Reconciliation of Income Tax Benefit [Abstract]    
Income taxes at statutory rate 21.00% 21.00%
Increase (decrease) resulting from [Abstract]    
State income tax 6.76% 7.04%
Permanent differences (0.04%) (7.09%)
Research & development credit 2.32% 4.40%
Return to provision 0.98% 1.48%
Effect of state rate change 0.00% 0.41%
Valuation allowance (31.02%) (27.24%)
Effect of the deferred rate change 0.00% 0.00%
Effective tax rate 0.00% 0.00%
Federal [Member]    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]    
Operating loss carryforwards $ 85,905 $ 41,385
State [Member]    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]    
Operating loss carryforwards $ 80,266 $ 39,217