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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense $ 1,100    
Deferred tax assets:      
Accruals and reserves   $ 3,035 $ 2,642
Operating Lease, Liability   1,026  
Inventory   692 755
Stock-based compensation   2,892 1,918
Deferred Tax Assets, Debt Extinguishment   134 531
Deferred Tax Assets, Other   79 297
Total deferred tax assets   7,858 6,143
Deferred tax liabilities:      
Discount on Convertible Notes   0 (307)
Prepaids   (1,382) (2,370)
Operating Lease, Right-Of-Use Assets   (1,219)  
Tax depreciation in excess of book depreciation   (19) (183)
Goodwill and other assets amortized for tax   (617) (493)
Total deferred tax liabilities   (3,237) (3,353)
Total net deferred tax assets   $ 4,621 $ 2,790