INCOME TAXES - Net Operating Losses and Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Federal
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 203,835
Credit carryforwards	30,115
Net operating losses expected to expire unused	26,700
Tax credits expected to expire unused	100
State
Operating Loss Carryforwards [Line Items]
Net operating losses	13,810
Credit carryforwards	1,516
Net operating losses expected to expire unused	800
Tax credits expected to expire unused	9,100
OpenSpan, Inc. | Federal
Operating Loss Carryforwards [Line Items]
Net operating losses	64,847
Credit carryforwards	640
OpenSpan, Inc. | State
Operating Loss Carryforwards [Line Items]
Net operating losses	2,008
Credit carryforwards	$ 60