Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 263,642,069	$ 62,251,860
Prepaid expenses and other current assets	3,813,545	909,629
Total current assets	267,455,614	63,161,489
Property and equipment, net	16,831,697	235,590
Other long-term assets	516,395	1,687,212
Total assets	284,803,706	65,084,291
Current liabilities:
Accounts payable	3,748,718	359,787
Accrued expenses	9,616,624	2,437,017
Accrued indemnification obligation	4,216,000	4,080,500
Total current liabilities	17,581,342	6,877,304
Total liabilities	17,581,342	6,877,304
Redeemable common stock; par value $0.0001 per share, no shares issued and outstanding at September 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, 27,645,108 shares issued and outstanding at September 30, 2016; 22,080,000 shares authorized, 6,817,093 shares issued and outstanding at December 31, 2015	2,765	682
Additional paid-in capital	383,406,992	115,723,046
Accumulated deficit	(116,187,393)	(58,550,520)
Total stockholder's equity	267,222,364	57,174,078
Total liabilities, redeemable common stock and stockholders' equity	$ 284,803,706	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