CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT) - 6 months ended Jun. 30, 2016 - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Balances at Dec. 31, 2015	$ 42,035	$ 381,118,489	$ (79,399)	$ (209,734,988)	$ 171,346,137
Balances (in shares) at Dec. 31, 2015	42,034,733
Exercise of stock options	$ 56	109,251			109,307
Exercise of stock options (in shares)	56,417
Stock-based compensation	$ 117	6,390,875			6,390,992
Stock-based compensation (in shares)	116,812
Employee stock purchase plan	$ 45	137,880			137,925
Employee stock purchase plan (in shares)	44,636
Net loss				(24,115,400)	(24,115,400)
Unrealized gain on securities			175,645		175,645
Balances at Jun. 30, 2016	$ 42,253	$ 387,756,495	$ 96,246	$ (233,850,388)	$ 154,044,606
Balances (in shares) at Jun. 30, 2016	42,252,598