Stock Option Plans, Shares Reserved and Warrants (Details 3)	Jun. 30, 2018 shares
Reserved shares of common stock for issuance upon exercise	14,161,450
2009 Equity Incentive Plan [Member]
Reserved shares of common stock for issuance upon exercise	9,352,243
RSU [Member]
Reserved shares of common stock for issuance upon exercise	1,642,212
Warrants [Member]
Reserved shares of common stock for issuance upon exercise	3,166,995