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INCOME TAXES - Net Operating Losses and Credit Carryforwards (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Reduction of income tax provision due to tax holidays $ 1,700 $ 1,900 $ 1,300
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating losses 124,115    
Credit carryforwards 24,372    
Net operating losses expected to expire unused 29,500    
Tax credits expected to expire unused 100    
Carryforwards with unlimited carryforward period 47,300    
State      
Operating Loss Carryforwards [Line Items]      
Net operating losses 9,149    
Credit carryforwards 1,895    
Net operating losses expected to expire unused 800    
Tax credits expected to expire unused 9,000    
Carryforwards with unlimited carryforward period 1,200    
OpenSpan, Inc. | Federal      
Operating Loss Carryforwards [Line Items]      
Net operating losses 76,826    
Credit carryforwards 640    
OpenSpan, Inc. | State      
Operating Loss Carryforwards [Line Items]      
Net operating losses 1,466    
Credit carryforwards $ 60