Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Stockholders' equity:
Series A Preferred stock, par value	$ 0.01	$ 0.01
Series A Preferred stock, authorized shares	10,000,000	10,000,000
Series A Preferred stock, issued shares	0	0
Series A Preferred stock, outstanding shares	0	0
Series B Preferred stock, par value	$ 0.01	$ 0.01
Series B Preferred stock, authorized shares	10,000,000	10,000,000
Series B Preferred stock, issued shares	750,000	750,000
Series B Preferred stock, outstanding shares	750,000	750,000
Series B liquidation preference	$ 909,375	$ 907,500
Series C Preferred stock, par value	$ 0.01	$ 0.01
Series C Preferred stock, authorized shares	10,000,000	10,000,000
Series C Preferred stock, issued shares	177,904	177,904
Series C Preferred stock, outstanding shares	177,904	177,904
Series C liquidation preference	$ 97,847	$ 97,847
Series D Preferred stock, par value	$ 0.01	$ 0.01
Series D Preferred stock, authorized shares	10,000,000	10,000,000
Series D Preferred stock, issued shares	1,751,005	1,751,005
Series D Preferred stock, outstanding shares	1,751,005	1,751,005
Series D liquidation preference	$ 5,014,692	$ 4,920,178
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	90,000,000	90,000,000
Common stock, issued shares	67,488,153	67,066,278
Common stock, outstanding shares	67,488,153	67,066,278