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Commitments and Contingencies- Right of Use Assets and Liabilities (Details) $ in Thousands		1 Months Ended		3 Months Ended
	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2020 USD ($) ft²	May 31, 2020 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
ROU asset				$ 119		$ 163
Lease liability				114		138
Lease liabilities, long term				$ 14		$ 37
Period Of Warranty From Date Of Shipment				1 year
Extended warranty minimum period				1 year
Right of use assets and liabilities
Weighted-average remaining lease term				4 months 24 days
Operating lease costs				$ 61	$ 82
Chief Executive Officer
Period for Severance Payment				12 months
JAPAN
Area of sublease space | ft²	500	500
Sublease rent per month		$ 1
Singapore
Area of sublease space | ft²	275	275
Hong Kong
Area of sublease space | ft²	3,000	3,000
Sublease rent per month		$ 2
Cost of revenue
Right of use assets and liabilities
Operating lease costs				$ 29	30
Operating expenses
Right of use assets and liabilities
Operating lease costs				$ 32	$ 52
Space located in Irvine, California for executive offices, sales, finance and administration
Area of sublease space | ft²	4,351	4,351
Sublease rent per month		$ 6
Percentage of annual increase in sublease rent		3.00%
Shenzhen, China manufacturing facility
Area of sublease space | ft²	14,476	14,476
Sublease rent per month		$ 8	$ 7
Shenzhen, China manufacturing facility | Singapore
Sublease rent per month		$ 1
Office space located in Los Angels, California
Area of sublease space | ft²	425	425
Sublease rent per month	$ 1

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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