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Income Taxes - Provision for Income Taxes Reconciliation to Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Federal tax benefit, at statutory rate | $ (14,371) | $ (10,021) | $ (23,192)
State benefit, net of federal benefit | (370) | (148) | (1,285)
Foreign tax rate difference | (259) | (358) | (140)
Valuation allowance against future tax benefits | 13,564 | 6,029 | 26,410
Gain on sale of foreign subsidiaries | 0 | 3,008 | 0
Sub-part F income | 0 | 791 | 0
Loss on conversion of debt | 0 | 0 | 2,015
Research and development credits | (2,222) | (1,415) | (2,355)
Share-based compensation | 1,010 | (879) | (1,134)
Non-deductible officers compensation | 108 | 1,449 | 0
True-up of prior year provisions | 2,123 | 1,681 | 0
Other | (48) | 54 | 429
(Benefit) Provision for income taxes | $ (465) | $ 191 | $ 748

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126970579&loc=d3e23163-113944 + Details
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