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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Income before taxes from U.S. operations	$ (84,800)	$ (103,100)	$ (92,700)
Income before taxes from foreign operations	$ 900	$ 800	$ 1,000
Statutory tax rate	21.00%	21.00%	35.00%
Valuation allowance	$ 298,658	$ 275,540
Net operating loss carryforwards	226,900
Research and development credit carryforward	45,900
Total unrecognized tax benefit	21,979	20,447	$ 18,786	$ 16,785
Accrued interest or penalties	0	$ 0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 889,600
Net operating loss carryforward, expiration	2024
Research and development credit carryforward	$ 36,400
Research and developmen tax credit carryforward, expiration	2024
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 609,400
Net operating loss carryforward, expiration	2025
Research and development credit carryforward	$ 36,800

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