Share-Based Compensation (Details) - USD ($)		1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 13, 2015	Apr. 30, 2015	Mar. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	May. 31, 2015
Consultants
Assumptions used in Black-Scholes option pricing model
Share-based compensation expense				$ 445,000
Directors and Employees
Assumptions used in Black-Scholes option pricing model
Share-based compensation expense				$ 3,736,700
Equity Incentive Plan | 2015 Plan
Share-Based Compensation
Number of shares reserved for grant			7,500,000		7,500,000	9,500,000
Number of shares available for future issuance				4,769,527
Stock options
Additional disclosures
Fair value of common shares	$ 15.00	$ 1.04	$ 0.90
Assumptions used in Black-Scholes option pricing model
Total unrecognized compensation expense				$ 64,947,600
Remaining weighted-average service period				3 years 8 months 23 days
Stock options | 2015 Plan
Number of Options
Options outstanding at beginning (in shares)		4,012,500		4,012,500
Granted (in shares)		527,500	4,012,500	717,973
Options outstanding at end (in shares)			4,012,500	4,730,473	4,012,500
Options exercisable at end (in shares)				4,615,000
Weighted Average Exercise Price
Options outstanding at beginning (in dollars per shares)		$ 0.90		$ 0.90
Granted (in dollars per shares)				6.09
Options outstanding at end (in dollars per shares)			$ 0.90	1.69	$ 0.90
Options exercisable at end (in dollars per shares)				1.23
Weighted Average Grant Date Fair Value (in dollars per shares)
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue				15.59	15.00
Granted (in dollars per shares)				16.65
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue				15.59	$ 15.00
Options exercisable at end (in dollars per shares)				$ 15.48
Additional disclosures
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2				9 years 8 months 27 days	9 years 11 months 16 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2				9 years 8 months 27 days	9 years 11 months 16 days
Options exercisable at end				9 years 8 months 23 days
Aggregate Intrinsic Value Options outstanding at beginning		$ 56,576,250		$ 56,576,250
Aggregate Intrinsic Value Options outstanding at end			$ 56,576,250	69,643,037	$ 56,576,250
Aggregate Intrinsic Value Options exercisable at end				$ 67,946,480
Stock options | Employees
Number of Options
Granted (in shares)				487,500
Weighted Average Exercise Price
Granted (in dollars per shares)				$ 1.04
Weighted Average Grant Date Fair Value (in dollars per shares)
Granted (in dollars per shares)				$ 15.00
Additional disclosures
Vesting terms				4 years
Assumptions used in Black-Scholes option pricing model
Volatility				75.00%
Risk free interest rate				1.55%
Expected term, in years				6 years 3 months
Dividend yield				0.00%
Stock options | Consultants
Number of Options
Granted (in shares)				40,000
Weighted Average Exercise Price
Granted (in dollars per shares)				$ 1.04
Weighted Average Grant Date Fair Value (in dollars per shares)
Granted (in dollars per shares)				$ 15.00
Additional disclosures
Vesting terms				4 years
Assumptions used in Black-Scholes option pricing model
Volatility				101.00%
Risk free interest rate				2.35%
Expected term, in years				9 years 9 months 15 days
Dividend yield				0.00%
Stock options | Directors and Employees
Number of Options
Granted (in shares)				190,473
Weighted Average Exercise Price
Granted (in dollars per shares)				$ 20.09
Weighted Average Grant Date Fair Value (in dollars per shares)
Granted (in dollars per shares)				$ 20.09
Assumptions used in Black-Scholes option pricing model
Volatility				85.50%
Risk free interest rate				1.89%
Stock options | Directors and Employees | Minimum
Additional disclosures
Vesting terms				3 years
Assumptions used in Black-Scholes option pricing model
Expected term, in years				6 years
Stock options | Directors and Employees | Maximum
Additional disclosures
Vesting terms				4 years
Assumptions used in Black-Scholes option pricing model
Expected term, in years				6 years 3 months