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INCOME TAXES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current [Abstract]      
U.S. federal $ (91) $ (61) $ 0
U.S. state (2) (2) 0
Foreign (2,195) (2,014) (3,176)
Total current tax expense (2,288) (2,077) (3,176)
Deferred [Abstract]      
U.S. federal 2,089 7,325 3,728
U.S. state 0 0 0
Foreign 65 (2,866) (34)
Total deferred tax benefit 2,154 4,459 3,694
Total income tax benefit (expense) (134) 2,382 518
Deferred Tax Assets [Abstract]      
Net operating loss carry forwards (offshore) 522 323 216
Net operating loss carry forwards (U.S.) and credit 12,173 9,981 3,218
Deferred revenue (offshore) 361 556 1,181
Accruals (U.S.) 15 22 15
Reserves and other (offshore) 1,528 884 426
Stock-based compensation (U.S.) 2,283 1,599 1,168
Property and equipment (U.S.) 1 164 3
Lease liability 559 659 0
Total gross deferred tax assets 17,442 14,188 6,227
Less: valuation allowance (919) (848) (896)
Total deferred tax assets 16,523 13,340 5,331
Deferred Tax Liabilities [Abstract]      
Fixed assets (589) (697) 0
Deferred revenue (offshore) (1,486) (967) 0
Unrealized gain on trading securities 0 (1,886) 0
Equity Investments (2,584) 0 0
Total deferred tax liabilities (4,659) (3,550) 0
Translation difference 0 0 0
Deferred tax assets, net $ 11,864 $ 9,790 5,331
Income Taxes [Abstract]      
Net operating loss carryforwards subject to annual limitation ownership change     $ 11,957
Effective Tax Rate Reconciliation [Abstract]      
Income tax provision at statutory rate 21.00% 21.00% 21.00%
Stock Compensation (12.75%) (36.99%) (1.05%)
Foreign rate differential (11.60%) (5.07%) (6.44%)
Other permanent difference (0.23%) 11.71% 2.82%
Foreign income taxed in US 10.32% 6.05% 6.94%
Foreign Research Expense (6.59%) (8.80%) (5.82%)
Change in valuation allowance 0.16% (0.25%) (20.19%)
Total income tax expense (benefit) 0.31% (12.35%) (2.74%)
Aggregate Changes in Balance of Gross Unrecognized Tax Benefits [Abstract]      
Beginning balance $ 570 $ 44 $ 44
Increase of unrecognized tax benefits taken in prior years 52 116 0
Increase of unrecognized tax benefits related to current year 5,476 410 0
Reductions for tax positions related to prior years (32) 0 0
Reductions to unrecognized tax benefits related to lapsing statute of limitations 0 0 0
Ending balance 6,066 570 $ 44
Accrued penalties 44 44  
Unrecognized tax benefits that would impact effective tax rate 5,950    
U.S. Federal [Member]      
Income Taxes [Abstract]      
Increase (decrease) in valuation allowance 160 288  
Net operating loss carry-forwards $ 56,077 44,333  
Operating loss carry-forwards, expiration date Dec. 31, 2022    
Research credit carry-forwards $ 200 359  
Tax credit carry-forwards, expiration date Dec. 31, 2022    
U.S. State [Member]      
Income Taxes [Abstract]      
Increase (decrease) in valuation allowance $ 237 237  
Net operating loss carry-forwards $ 545 545  
Operating loss carry-forwards, expiration date Dec. 31, 2032    
Research credit carry-forwards $ 377 377  
PRC [Member]      
Income Taxes [Abstract]      
Increase (decrease) in valuation allowance 522 323  
Net operating loss carry-forwards $ 2,086 $ 1,294  
Operating loss carry-forwards, expiration date Dec. 31, 2022    
Effective period of preferential income tax rate 3 years    
PRC [Member] | Minimum [Member]      
Income Taxes [Abstract]      
Foreign corporate tax rate 12.50% 12.50% 12.50%
PRC [Member] | Maximum [Member]      
Income Taxes [Abstract]      
Foreign corporate tax rate 25.00%