Quarterly report pursuant to Section 13 or 15(d)

SELECTED FINANCIAL STATEMENT CAPTIONS - ASSETS (Details 1)

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SELECTED FINANCIAL STATEMENT CAPTIONS - ASSETS (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]      
Prepaid insurance $ 453 $ 735  
Other prepaid expenses and current assets 649 667  
Prepaid expenses and other current assets $ 1,102 $ 1,402 $ 603