Income Taxes - Net Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carry-forward	$ 51,125	$ 48,766
Stock-based compensation	8,912	9,071
Chargeback reserves	3,336	14,173
Reserve for product returns	8,001	8,012
Inventory valuation reserve	8,423	9,688
Legal reserve	15,294	0
Long-term debt	56,117	16,156
Other	16,793	16,444
Total deferred tax assets	168,001	122,310
Valuation allowance	(119,156)	(71,157)	$ (10,500)
Net deferred tax assets	48,845	51,153
Deferred tax liabilities:
Prepaid expenses	(2,190)	(2,137)
Right of Use Asset	(5,311)	0
Depreciation & amortization – tax over book	(41,534)	(49,547)
Other	(35)	(35)
Total deferred tax liabilities	(49,070)	(51,719)
Net deferred income tax liability	$ (225)	$ (566)