Commitments and Contingencies - Right of Use Assets and Liabilities (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($) ft²	May 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Right-of-use assets and lease liabilities capitalized			5.50%	6.75%	5.50%	6.75%
ROU asset			$ 207		$ 207		$ 334
Lease liability			150		150		219
Lease liabilities, long-term			$ 71		$ 71		$ 140
Right of use assets and liabilities
Weighted-average remaining lease term			9 months 18 days		9 months 18 days
Operating lease costs			$ 68	$ 77	$ 234	$ 187
JAPAN
Area of sublease space | ft²	500
Sublease rent per month	$ 1
Singapore
Area of sublease space | ft²	275
Hong Kong
Area of sublease space | ft²	3,000
Sublease rent per month	$ 2
Cost of revenue
Right of use assets and liabilities
Operating lease costs			29	29	88	73
Operating expenses
Right of use assets and liabilities
Operating lease costs			$ 39	$ 48	$ 146	$ 114
Space located in Irvine, California for executive offices, sales, finance and administration
Area of sublease space | ft²	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
Sublease rent per month	$ 8	$ 7
Shenzhen, China manufacturing facility | Singapore
Sublease rent per month	$ 1