Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Narrative (Details)

v3.19.1
COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 08, 2019
defendant
Jul. 16, 2018
USD ($)
Apr. 02, 2018
USD ($)
Mar. 29, 2016
plaintiff
Jan. 31, 2016
claim
May 31, 2013
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]                
Rent expense for operating leases             $ 2,200 $ 2,000
Number of days to provide notification to terminate purchase commitment agreement           90 days    
Minimum monthly purchase amount           $ 40    
Employment Agreements                
Loss Contingencies [Line Items]                
Number of weeks (months) to provide notice of termination of agreement by either party             1 month  
Securities Class Actions                
Loss Contingencies [Line Items]                
Number of complaints filed | claim         2      
Number of lead plaintiffs named | plaintiff       2        
Litigation settlement amount     $ 1,750          
Securities Class Actions | Subsequent Event | Executive Officers                
Loss Contingencies [Line Items]                
Number of parties named in putative securities class action suit | defendant 2              
Shareholder Derivative Claims                
Loss Contingencies [Line Items]                
Litigation settlement amount   $ 250