Annual report pursuant to Section 13 and 15(d)

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details)

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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]          
Right-of-use assets   $ 9,703 $ 17,895    
Cumulative-effect adjustment on accumulated deficit   $ 30,374 $ 34,026 $ 53,815 $ 109,877
Accounting Standards Update 2016-02          
Lessee, Lease, Description [Line Items]          
Right-of-use assets $ 32,800        
Lease liability 33,200        
Derecognized deferred rent $ 400        
Estimated incremental borrowing rate for estimation of present value of lease payments 9.00%        
Cumulative effect adjustment | Accounting Standards Update 2016-02          
Lessee, Lease, Description [Line Items]          
Cumulative-effect adjustment on accumulated deficit $ 0