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ORDINARY SHARE AND SHARE INCENTIVE PLANS - Stock Option Activity (Details) - 2017 Equity Incentive Plan - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of shares outstanding    
Options Outstanding at the beginning of the period (in shares) 206 244
Options exercised (in shares) (25) (35)
Options forfeited or expired (in shares)   (3)
Options Outstanding at the end of the period (in shares) 181 206
Weighted average exercise price    
Options Outstanding at the beginning of the period (in dollars per share) $ 2.24 $ 2.26
Options exercised (in dollars per share) 2.24 2.24
Options forfeited or expired (in dollars per share)   4.17
Options Outstanding at the end of the period (in dollars per share) $ 2.24 $ 2.24