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Income Taxes - Provision for Income Taxes Reconciliation to Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal tax benefit, at statutory rate	$ (10,021)	$ (23,192)	$ (8,311)
State benefit, net of federal benefit	(148)	(1,285)	27
Foreign tax rate difference	(358)	(140)	476
Valuation allowance against future tax benefits	6,029	26,410	9,168
Gain on sale of foreign subsidiaries	3,008	0	0
Sub-part F income	791	0	0
Loss on conversion of debt	0	2,015	0
Research and development credits	(1,415)	(2,355)	(1,456)
Share-based compensation	(879)	(1,134)	341
Non-deductible officers compensation	1,449	0	0
True-up of prior year provisions	1,681	0	0
Other	54	429	291
Provision for income taxes	$ 191	$ 748	$ 536

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