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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |
Income (loss) before taxes from U.S. operations | $ (275,400) | $ 28,900 | $ (84,800) |
Income before taxes from foreign operations | $ 800 | $ 600 | $ 900 |
Statutory tax rate | 21.00% | 21.00% | 21.00% |
Deferred income taxes | $ (93,649) |  |  |
Valuation allowance | 366,940 | $ 300,505 |  |
Net operating loss carryforwards | 378,000 |  |  |
Research and development credit carryforward | 60,700 |  |  |
Total unrecognized tax benefit | 8,335 | 5,954 | $ 21,979 | $ 20,447
Accrued interest or penalties | 0 | $ 0 |  |
Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 1,491,300 |  |  |
Research and development credit carryforward | $ 39,100 |  |  |
Research and development tax credit carryforward, expiration | 2024 |  |  |
Federal [Member] | With Expiration [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 774,900 |  |  |
State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 997,400 |  |  |
Research and development credit carryforward | $ 36,900 |  |  |
Minimum [Member] | Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward, expiration | 2024 |  |  |

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.1) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.2) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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