Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets:
Accrued expenses	$ 3,759	$ 3,572
Deferred revenue	0	13,719
Bad debts	4,859	0
Sales return and allowances	659	2,296
Accrued settlement costs	3,276	2,689
Research and development and other tax credits	2,349	2,326
Net operating loss	14,350	3,118
Share-based compensation	3,439	3,425
Lease obligation	1,044	0
Other	2,124	971
Deferred Tax Liabilities:
Prepaid expenses	(1,189)	(1,823)
Right of use asset	(868)	0
Property and equipment	(1,582)	(2,519)
Unearned insurance refund	(894)	0
Deferred costs of goods sold	(322)	0
Intangible assets	(389)	(443)
Net Deferred Tax Assets
Net Deferred Tax Assets	30,615	27,331
Less: Valuation allowance	(30,615)	(27,331)
Net Deferred Tax Assets after Valuation Allowance	$ 0	$ 0