Income Tax Expense (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred:
Net operating loss carryforwards	$ 124,881	$ 66,280
Accrued expenses	6,582	4,391
Tax credits	11,314	8,438
Bad debt	91	81
Inventory	4,424	2,307
Capitalized research and development	21,374	8,948
Deferred compensation	3,596	3,075
Other	964	1,659
Deferred tax asset	173,226	95,179
Valuation allowance	(133,784)	(67,172)
Total deferred tax assets	39,442	28,007
Deferred Tax Liabilities, Net [Abstract]
Depreciation and amortization	(15,316)	(1,183)
Convertible debt	(9,760)	(12,056)
Other	0	0
Total deferred tax liabilities	(40,321)	(28,886)
Net deferred tax liability	(879)	(879)
Trademarks and trade names
Deferred Tax Liabilities, Net [Abstract]
Intangible assets	(1,027)	(1,002)
Developed Technology and Trademark
Deferred Tax Liabilities, Net [Abstract]
Intangible assets	$ (14,218)	$ (14,645)