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11. Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Valuation of financial instruments at fair value
    Fair Value Measurements at March 31, 2017  
    Level 1     Level 2     Level 3  
Assets                  
Cash and cash equivalents   $ 137,029     $     $  
Total assets     137,029              
                         
Liabilities                        
Total liabilities                  
    $ 137,029     $     $  

 

    Fair Value Measurements at December 31, 2016  
    Level 1     Level 2     Level 3  
Assets                  
Cash and cash equivalents   $ 66,269     $     $  
Total assets     66,269              
                         
Liabilities                        
Total liabilities                  
    $ 66,269     $     $