CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Statement - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,291,966)	$ (10,191,272)	$ (22,337,314)	$ (30,656,068)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation loss	(1,544)	(81)	(13,486)	(1,877)
Unrealized gain or reversal of previous losses on securities available-for-sale	0	(7,997)	9,065	(2,865)
Total other comprehensive income (loss)	(1,544)	(8,078)	(4,421)	(4,742)
Total comprehensive loss	(4,293,510)	(10,199,350)	(22,341,735)	(30,660,810)
Preferred stock dividend	6,060	6,060	18,180	18,180
Comprehensive loss attributable to common stockholders	$ (4,299,570)	$ (10,205,410)	$ (22,359,915)	$ (30,678,990)