Taxes - Constituents of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Non-current gross deferred tax assets:
Intangible asset in connection with change in tax structure	$ 437,500	$ 0
Stock-based compensation expense	15,042	13,818
Federal and state tax credit carryforwards	8,491	7,395
Foreign net operating losses	4,286	0
Depreciation	3,522	2,475
Inventory and revenue related	2,934	3,233
Bonuses, commissions, and other compensation	1,609	5,470
Other	3,550	2,425
Gross non-current deferred tax assets	476,934	34,816
Valuation allowance	(7,312)	(6,112)
Net non-current deferred tax assets	469,622	28,704
Non-current gross deferred tax liabilities:
GILTI tax basis differences in connection with change in tax structure	(350,000)	0
Other GILTI tax basis differences	2,446	0
Nondeductible intangible assets	0	(44)
Other	0	(962)
Net non-current deferred tax liabilities	$ 352,446	$ 1,006