Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Federal and state NOL carryforward	$ 31,157	$ 9,889
Fixed assets	3	462
Accruals	27,946	682
Stock-based compensation	1,639	454
Inventory	667	835
Other intangibles	18,566	9,151
Allowance for customer credits and doubtful accounts		843
Deferred rent		985
Contribution carryforward	103
Business interest limitation	9,844
Deferred state income tax	309	231
Other	1,032	186
Total gross deferred tax assets	91,266	23,718
Less: valuation allowance	(77,864)	(19,975)
Total deferred tax assets	13,402	3,743
Deferred tax liabilities:
Indefinite lived intangibles	(10,696)	(9,382)
Fixed Assets	(2,586)
Prepaids	(120)	(90)
Debt discount		(921)
Total gross deferred tax liabilities	(13,402)	(10,393)
Net deferred tax liabilities		$ (6,650)
Increase in valuation allowance	$ (57,900)