Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($)
Jan. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use assets   $ 17,895,000 $ 25,709,000
Lease liability   $ 19,300,000  
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use assets $ 32,800,000    
Lease liability 33,200,000    
Derecognized deferred rent $ 399,000    
Estimated incremental borrowing rate for estimation of present value of lease payments 9.00%    
Cumulative-effect adjustment on accumulated deficit $ 0