Annual report pursuant to Section 13 and 15(d)

Organization and summary of significant accounting policies (Income taxes) (Details)

v3.7.0.1
Organization and summary of significant accounting policies (Income taxes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income taxes:    
Unrecognized tax benefits
Accrued interest and penalties  
Interest and penalties expense