CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2016		58,945,607
Balance at Dec. 31, 2016	$ 195,088,589	$ 58,949	$ 351,873,801	$ (156,844,161)	$ 0
Increase (Decrease) in Stockholders' Equity
Vesting of stock options for compensation	$ 8,467,278		8,467,278
Exercise of stock options (in shares)	2,080,648	2,080,648
Exercise of stock options	$ 2,816,735	$ 2,081	2,814,654
Exercise of warrants (in shares)		675,000
Exercise of warrants	2,396,250	$ 675	2,395,575
Issuance of common stock (in shares)		9,200,000
Issuance of common stock	$ 42,995,371	$ 9,200	42,986,171
Issuance of common stock for vested RSAs (in shares)	1,013,763	1,013,763
Issuance of common stock for vested RSAs	$ 0	$ 1,013	(1,013)
RSAs withheld to cover taxes	(507,398)		(507,398)
Other comprehensive income (loss)	(1,124,538)				(1,124,538)
Net income (loss)	(64,591,727)			(64,591,727)
Balance (in shares) at Dec. 31, 2017		71,915,018
Balance at Dec. 31, 2017	185,540,560	$ 71,918	408,029,068	(221,435,888)	(1,124,538)
Increase (Decrease) in Stockholders' Equity
Adoption of ASC Topic 606 (Note 1)	16,475			16,475
Vesting of stock options for compensation	$ 4,259,795		4,259,795
Exercise of stock options (in shares)	131,051	131,051
Exercise of stock options	$ 232,416	$ 131	232,285
Issuance of common stock for vested RSAs (in shares)	1,075,893	1,075,893
Issuance of common stock for vested RSAs	$ 0	$ 1,069	(1,069)
RSAs withheld to cover taxes	(306,120)		(306,120)
Other comprehensive income (loss)	(540,807)				(540,807)
Net income (loss)	(4,447,933)			(4,447,933)
Balance (in shares) at Jun. 30, 2018		73,121,962
Balance at Jun. 30, 2018	$ 184,754,386	$ 73,118	$ 412,213,959	$ (225,867,346)	$ (1,665,345)