Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Narrative (Details)

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STOCKHOLDERS' EQUITY - Narrative (Details)
 1 Months Ended 2 Months Ended 6 Months Ended 12 Months Ended
Aug. 09, 2019
USD ($)
shares
Feb. 01, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
May 31, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Jun. 30, 2017
class
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
May 16, 2019
USD ($)
Apr. 07, 2016
shares
Jan. 12, 2016
USD ($)
Jul. 28, 2015
USD ($)
Class of Stock [Line Items]                        
Number of classes of stock | class           2            
Preferred stock, shares authorized (in shares)     5,000,000       5,000,000 5,000,000        
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.001       $ 0.001 $ 0.001        
Common stock, shares authorized (in shares)     50,000,000       50,000,000 50,000,000        
Common stock, par value (in dollars per share) | $ / shares     $ 0.001       $ 0.001 $ 0.001        
Authorized amount of shares to be repurchased | $                 $ 8,000,000.0   $ 70,000,000.0 $ 15,000,000.0
Total purchase price of common stock repurchased | $       $ 4,700,000     $ 10,117,000          
Repurchase of common stock (in shares)     97,785 612,729 383,127              
Aggregate price of common stock repurchased | $     $ 552,000 $ 6,700,000 $ 2,900,000   10,117,000 $ 0        
Remaining authorized repurchase amount | $     $ 21,900,000       $ 21,900,000          
Restricted Stock | 2016 Plan                        
Class of Stock [Line Items]                        
Number of shares granted (in shares) 1,117,485 22,603         1,140,088 34,202        
Value of shares granted | $ $ 7,900,000 $ 377,000                    
Shares vesting period 3 years 3 years                    
Common Stock | 2016 Plan                        
Class of Stock [Line Items]                        
Number of shares authorized (in shares)                   2,500,000    
Number of shares available for issuance (in shares)     1,219,583       1,219,583          
Director                        
Class of Stock [Line Items]                        
Percentage of common stock outstanding (more than)                 5.00%