Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets:
Sales allowances and doubtful accounts	$ 2,991	$ 1,964
Inventory reserve	652	962
Deferred revenue	0	590
Accrued expenses	206	23
Property, plant and equipment	272	258
Tax operating loss carryforwards	10,851	9,951
Tax credit and other carryforwards	5,996	1,299
Stock compensation	566	538
Total deferred tax assets	21,534	15,585
Less valuation allowance	(18,562)	(12,120)
Net deferred tax assets	2,972	3,465
Deferred Tax Liabilities:
Convertible debt conversion features	(3,070)	(3,514)
Foreign exchange	(14)	(28)
Intangible assets	(93)	(138)
Total deferred tax liabilities	(3,177)	(3,680)
Net deferred tax liability	$ (205)	$ (215)