Income Taxes - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Significant components of the Company's deferred tax assets and liabilities
Intangible assets	$ 1,197	$ 1,146
Deferred revenue	8,027	9,304
Interest expense	11,299	5,239
Other reserves and accruals	699	592
Tax credit carryforwards	3,843	3,065
Amortization of stock-based compensation	9,081	8,442
Non-Compensatory Warrants	4,322	3,597
Capitalized research & development expenditures	27,084	23,410
Right Of Use Liability (Operating Leases)	39,237	16,715
Net operating loss carryforwards	64,523	58,364
Total deferred tax asset	169,312	129,874
Valuation allowance	(117,353)	(100,493)
Net deferred tax assets	51,959	29,381
Intangible assets	(15)	(37)
Convertible debt	(7,718)	(9,217)
Right Of Use Liability (Operating Leases)	(40,298)	(18,066)
Other reserves and accruals	(16)	(20)
Property, plant and equipment and right of use assets	(3,912)	(2,041)
Deferred tax liability	(51,959)	(29,381)
U.S.
Significant components of the Company's deferred tax assets and liabilities
Deferred revenue	7,898	9,304
Interest expense	11,299	5,239
Other reserves and accruals	699	592
Tax credit carryforwards	2,590	1,865
Amortization of stock-based compensation	9,081	8,442
Non-Compensatory Warrants	4,322	3,597
Capitalized research & development expenditures	22,601	19,116
Right Of Use Liability (Operating Leases)	39,237	16,715
Net operating loss carryforwards	54,947	49,058
Total deferred tax asset	152,674	113,928
Valuation allowance	(100,731)	(84,567)
Net deferred tax assets	51,943	29,361
Intangible assets	(15)	(37)
Convertible debt	(7,718)	(9,217)
Right Of Use Liability (Operating Leases)	(40,298)	(18,066)
Property, plant and equipment and right of use assets	(3,912)	(2,041)
Deferred tax liability	(51,943)	(29,361)
Foreign
Significant components of the Company's deferred tax assets and liabilities
Intangible assets	1,197	1,146
Deferred revenue	129
Tax credit carryforwards	1,253	1,200
Capitalized research & development expenditures	4,483	4,294
Net operating loss carryforwards	9,576	9,306
Total deferred tax asset	16,638	15,946
Valuation allowance	(16,622)	(15,926)
Net deferred tax assets	16	20
Other reserves and accruals	(16)	(20)
Deferred tax liability	$ (16)	$ (20)