Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accruals and reserves	$ 1,133	$ 1,783
Income tax credit carryforwards	3,150	3,182
Interest	1,351	(126)
Inventory	4,959	4,302
Legal settlement	4,693	6,881
Net operating losses	45,092	34,376
Stock-based compensation	1,182	1,542
Total deferred tax assets	61,560	51,940
Valuation allowance	(46,578)	(42,236)
Total deferred tax assets, net of valuation allowance	14,982	9,704
Deferred tax liabilities:
Property and equipment	(21)	1,249
Goodwill and intangibles	(1,972)	3,945
Investment in foreign partnership	(13,370)	(14,859)
Total deferred tax liabilities	(15,363)	(9,665)
Net deferred tax (liabilities)	$ (381)
Net deferred tax assets		$ 39