Commitments and Contingencies - Additional Information (Detail)		1 Months Ended				3 Months Ended	6 Months Ended
	Aug. 12, 2016 ft²	Dec. 31, 2015 USD ($)	Oct. 31, 2015 ft²	Sep. 30, 2015 Patent	Jul. 31, 2013 ft²	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Apr. 30, 2014 USD ($)
Commitments and Contingencies [Line Items]
Purchase price of property amount		$ 16,500,000
License agreement, upfront payment		500,000							$ 1,500,000
License agreement, maximum agreed additional payments upon achievement of development milestones									$ 4,500,000
License agreement, milestone payment		$ 600,000
Termination fee						$ 200,000
Magnetic Clutch Patents
Commitments and Contingencies [Line Items]
Patents allegedly infringed upon, number | Patent				2
Pigtail Patents
Commitments and Contingencies [Line Items]
Patents allegedly infringed upon, number | Patent				2
Patent One
Commitments and Contingencies [Line Items]
Patent expiration period							2020-09
Patent Two
Commitments and Contingencies [Line Items]
Patent expiration period							2020-12
Patent Three
Commitments and Contingencies [Line Items]
Patent expiration period							2021-10
Europe
Commitments and Contingencies [Line Items]
Facilities leases, base rent per month						$ 72,000	$ 72,000	€ 64,500
Lease Agreements
Commitments and Contingencies [Line Items]
Office space under capital lease | ft²	163,560
Lease agreement termination date	Aug. 31, 2026
Lease description							The Company has options to extend the initial term for three separate periods of five years each.
Capital lease term							15 years
Lease Agreements | Europe
Commitments and Contingencies [Line Items]
Office space under operating lease | ft²					33,000
Lease, expiration date					Jul. 31, 2023
Additional office space under operating lease | ft²			9,000
Lease Agreement Adjacent To Aachen Facility | Europe
Commitments and Contingencies [Line Items]
Office space under operating lease | ft²			30,000
Lease, expiration date			Jun. 30, 2017