Annual report pursuant to Section 13 and 15(d)

Income Taxes - Temporary Differences (Details)

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Income Taxes - Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Net operating loss carryforwards $ 36,250 $ 30,588 $ 27,578
Inventory write down 317 273 206
Depreciation 136 117  
Amortization     23
Interest limitation   336  
Allowance for doubtful accounts 274 285 117
Right-of-use liability 837    
Stock-based compensation 3,140 2,335 520
Total deferred tax assets 40,954 33,934 28,444
Deferred tax liabilities:      
Depreciation     (81)
Amortization (206) (43)  
Contract liabilities (7) (15) (6)
Net deferred tax assets 39,932 33,876 28,357
Valuation allowance $ (39,932) $ (33,876) $ (28,357)