Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Textual)

v3.8.0.1
Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]      
Less change in fair value of warrant liability $ 0 $ 422  
Investments, Fair Value Disclosure $ 3,500    
Warrant Expiration Date Apr. 18, 2018    
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