Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards
Income (loss) before provision for income taxes	$ 20,927,000	$ 17,602,000	$ 7,072,000
Current:
Federal	848,000	223,000
State	34,000	91,000	15,000
Foreign	918,000	3,119,000	2,016,000
Total current	1,800,000	3,433,000	2,031,000
Deferred:
Federal	(591,000)	(188,000)
State	(4,000)	(1,000)
Foreign	980,000	(2,151,000)
Total deferred	385,000
Total deferred	(104,000)	(2,340,000)
Total provision for income taxes	$ 2,185,000	$ 1,093,000	$ 2,031,000
Reconciliation of effective income tax rates and U.S. statutory federal income tax rate
Statutory federal income tax rate (as a percent)	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefits (as a percent)	0.10%	0.40%	0.20%
Valuation allowance (as a percent)	(19.30%)	(25.40%)	0.80%
Stock-based compensation (as a percent)	0.70%	(3.20%)	(1.90%)
Foreign tax rate differential (as a percent)	(2.60%)	(8.60%)	2.10%
Foreign tax incentives (as a percent)	(3.50%)	(3.20%)	(3.80%)
Foreign income inclusion (as a percent)	18.9	10.4	7.8
Gain from sale of IP		16.90%
Tax effect in equity method loss or gain from unconsolidated affiliates (as a percent)	(3.00%)	(2.60%)	1.10%
Others (as a percent)	(1.80%)	0.50%	1.40%
Effective tax rate (as a percent)	10.50%	6.20%	28.70%
Deferred tax assets:
Net operating loss carryforwards	$ 9,571,000	$ 11,275,000
Accruals, reserves and other	4,053,000	6,056,000
Credit carryforwards	206,000	358,000
Operating lease liability	60,000	125,000
Gross deferred tax assets	13,890,000	17,814,000
Valuation allowance	(11,885,000)	(15,371,000)
Total deferred tax assets	2,005,000	2,443,000
Deferred tax liabilities:
Operating lease right-of-use assets	(50,000)	(103,000)
Total net deferred tax assets (included in other assets)	1,955,000	2,340,000
Increase (decrease) in valuation allowance	$ (3,500,000)	(4,400,000)
Realized benefits of tax rate reduction (as a percent)	10.00%
Unrecognized tax benefit would favorably impact the effective tax rate in future periods if recognized	$ 1,100,000	1,100,000
Domestic Tax Authority
Deferred tax liabilities:
Operating loss carryforwards	31,900,000
State
Deferred tax liabilities:
Operating loss carryforwards	$ 21,000
Foreign Tax Authority
Deferred tax liabilities:
EIT income tax rate (as a percent)	25.00%
Preferential tax rate (as a percent)	15.00%
Benefit from foreign tax rate	$ 900,000	$ 1,000,000.0	$ 1,000,000.0