XML 62 R49.htm IDEA: XBRL DOCUMENT v3.6.0.2
Common stock reserved for future issuance (Details) - shares
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option grants outstanding (see Note 6) 2,161,085 2,022,353 1,891,058
Reserved for future stock option grants (see Note 6) 95,981 121,750  
Reserved for note conversion (see Note 2) 972,884 977,398  
Reserved for exercise of outstanding warrants (see Note 7) 169,335  
Total common stock reserved for future issuance 3,229,950 3,290,836