Quarterly report pursuant to Section 13 or 15(d)

SHORT TERM INVESTMENTS, PREPAID EXPENSES AND OTHER CURRENT ASSETS - Schedule of Short Term Investments (Details)

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SHORT TERM INVESTMENTS, PREPAID EXPENSES AND OTHER CURRENT ASSETS - Schedule of Short Term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Short term investments $ 13,348 $ 11,303
Government    
Debt Securities, Available-for-sale [Line Items]    
Short term investments 2,088 0
Asset Backed    
Debt Securities, Available-for-sale [Line Items]    
Short term investments 2,297 1,786
Industrial    
Debt Securities, Available-for-sale [Line Items]    
Short term investments 2,992 2,381
Financial    
Debt Securities, Available-for-sale [Line Items]    
Short term investments $ 5,971 $ 7,136