Shareholders' Equity - Shares of Class A common stock reserved for future issuance (Details)	Sep. 30, 2015 shares
Schedule Of Stockholders' Equity [Line Items]
Total shares reserved for future issuance	1,571,846
Common stock warrants outstanding | Derivative liability
Schedule Of Stockholders' Equity [Line Items]
Total shares reserved for future issuance	883,057
Common stock warrants outstanding | Equity security
Schedule Of Stockholders' Equity [Line Items]
Total shares reserved for future issuance	535,319
Stock options and grants
Schedule Of Stockholders' Equity [Line Items]
Total shares reserved for future issuance	148,970
Stock options outstanding under plans not approved by security holders
Schedule Of Stockholders' Equity [Line Items]
Total shares reserved for future issuance	4,500