Commitments and Contingencies - Additional Information (Detail)				3 Months Ended	9 Months Ended
	Aug. 27, 2015 ft² $ / ft²	Dec. 23, 2014 EUR (€)	Dec. 23, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Loss Contingencies [Line Items]
Counterclaim amount filed		€ 2,529,400	$ 3,060,827
Claims and counterclaims amount					€ 3,500,000	$ 4,235,350
Area of lease property | ft²	3,950
Annual rent per square foot | $ / ft²	46.50
Annual rent increase per square foot | $ / ft²	1.00
Rent expenses recognized				$ 0		$ 0
Description of lease agreement					The Company has agreed to pay the Sublandlord an annual rental at a rate equal to $46.50 per square foot, increasing by $1.00 per square foot on each anniversary of the Commencement Date.	The Company has agreed to pay the Sublandlord an annual rental at a rate equal to $46.50 per square foot, increasing by $1.00 per square foot on each anniversary of the Commencement Date.
Lease expiration date					Feb. 27, 2022	Feb. 27, 2022
Lease commencement date					Aug. 27, 2015	Aug. 27, 2015
Out License Fee [Member]
Loss Contingencies [Line Items]
Out-License Fee amount							$ 300,000
TUM [Member] | Out License Fee [Member]
Loss Contingencies [Line Items]
Out-License Fee amount							3,400,000
Reserved liability					€ 271,000		$ 302,273