Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

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Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Summary of Significant Accounting Policies (Textual)      
Deferred revenue $ 173   $ 234
Stock-based compensation 890 $ 286  
Right-of-use assets 563  
Operating lease liabilities 599    
Deposited in escrow as restricted cash 140 210  
Amount is current included prepaid assets and other current assets 70 70  
Amount is non current included prepaid assets and other current assets $ 70 $ 140