Commitments and Contingencies - Additional Information (Detail)				3 Months Ended		6 Months Ended
	Feb. 17, 2015 USD ($) ft² $ / ft²	Jan. 26, 2015 USD ($) ft²	May. 09, 2013 USD ($) ft²	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Commitments And Contingencies [Line Items]
Cash security deposit			$ 100,000
Leased space for administrative and research and development activities | ft²			20,000
Lease commencement date			Jun. 15, 2013
Lease period			10 years
Lease expiration date			Jun. 15, 2023
Rent expense				$ 600,000	$ 200,000	$ 1,100,000	$ 300,000
Tenant improvement allowances				3,000,000		3,000,000
Reduction in rent expense related to tenant improvement allowances				100,000		100,000
Cash
Commitments And Contingencies [Line Items]
Tenant improvement allowances				400,000		400,000
Other Current Assets
Commitments And Contingencies [Line Items]
Tenant improvement allowances				$ 2,600,000		$ 2,600,000
Merritt SAB 17, LP
Commitments And Contingencies [Line Items]
Leased space for administrative and research and development activities | ft²		18,000
Lease commencement date		Feb. 01, 2015
Lease period		10 years
Operating leases monthly base rent expense		$ 45,540
Operating leases future yearly base rent rate increase percent		3.00%
Operating lease additional renewal term		5 years
2355 Utah Industrial Capital, LLC
Commitments And Contingencies [Line Items]
Leased space for administrative and research and development activities | ft²	43,500
Lease commencement date	Jan. 01, 2016
Lease period	10 years 7 months
Operating leases monthly base rent expense	$ 124,183
Operating leases future yearly base rent rate increase percent	3.00%
Operating lease additional renewal term	5 years
Additional lease space agreement | ft²	17,000
Rent per square foot | $ / ft²	2.85
Maximum date to exercise additional lease option	Jul. 01, 2017