Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 131,432,653	$ 62,251,860
Prepaid expenses and other current assets	2,989,635	909,629
Total current assets	134,422,288	63,161,489
Property and equipment, net	8,289,589	235,590
Other long-term assets	400,134	1,687,212
Total assets	143,112,011	65,084,291
Current liabilities:
Accounts payable	1,144,099	359,787
Accrued expenses	3,458,574	2,437,017
Accrued indemnification obligation	4,080,500	4,080,500
Total current liabilities	8,683,173	6,877,304
Total liabilities	8,683,173	6,877,304
Redeemable common stock; par value $0.0001 per share, no shares issued and outstanding at June 30, 2016; 456.043 shares issued and outstanding at December 31, 2015		1,032,909
Stockholders' equity:
Common stock; par value $0.0001 per share, 100,000,000 shares authorized, 23,013,838 shares issued and outstanding at June 30, 2016; 22,080,000 shares authorized, 6,817,093 shares issued and outstanding at December 31, 2015	2,301	682
Additional paid-in capital	229,532,123	115,723,046
Accumulated deficit	(95,105,586)	(58,550,520)
Total stockholder's equity	134,428,838	57,174,078
Total liabilities, redeemable common stock and stockholders' equity	$ 143,112,011	65,084,291
Class D Preferred Stock
Stockholders' equity:
Preferred stock		309
Class C Preferred Stock
Stockholders' equity:
Preferred stock		237
Class B-1 Preferred Stock
Stockholders' equity:
Preferred stock		$ 324