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ACQUISITION OF CONTROLLING INTEREST IN THE COMPANY - Narrative (Details) - FBIO Acquisitions Inc. - $ / shares
Feb. 11, 2019
Nov. 14, 2018
B. Riley Financial, Inc.    
Business Acquisition [Line Items]    
Share price for acquisition (in dollars per share)   $ 3.25
B. Riley Financial, Inc. | Common Stock    
Business Acquisition [Line Items]    
Number of shares tendered (in shares)   7,037,482
Percentage of voting interests acquired (as a percent)   56.10%
Share price for acquisition (in dollars per share)   $ 3.25
Voting rights threshold for two board observers   24.00%
Voting rights threshold for one board observer   5.00%
Immediate Purchase | B. Riley Financial, Inc. | Common Stock    
Business Acquisition [Line Items]    
Number of shares tendered (in shares)   3,010,054
Purchase After Period Of Time From FINRA Approval | B. Riley Financial, Inc. | Common Stock    
Business Acquisition [Line Items]    
Number of shares tendered (in shares) 3,149,496  
Purchase After Period Of Time From FINRA Approval | Third Parties | Common Stock    
Business Acquisition [Line Items]    
Number of shares tendered (in shares) 877,932