Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

v3.19.2
Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Summary of Significant Accounting Policies (Textual)          
Deferred revenue $ 195   $ 195   $ 234
Stock-based compensation 858 $ 571 1,748 $ 857  
Right-of-use assets 473   473  
Operating lease liabilities 502   502    
Deposited in escrow as restricted cash 140 210 140 210  
Amount is current included prepaid assets and other current assets 70 70 70 70  
Amount is non current included prepaid assets and other current assets $ 70 $ 140 $ 70 $ 140