Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Textual)

v3.10.0.1
Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2016
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]          
Less change in fair value of warrant liability $ 141 $ 2,000 $ 141 $ 614  
Investments, Fair Value Disclosure $ 8,400   $ 8,400    
Warrant Expiration Date     Apr. 18, 2018    
Proceeds from Exercise Of Over Allotment And Warrants     $ 4,500    
Adjustments for New Accounting Pronouncement [Member]          
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]          
Deferred Tax Assets Unrecognized Tax Benefit         $ 12,000