Deferred Revenue - Additional Information (Detail) (Nonsoftware License Arrangement [Member], Stem Cell Therapeutics [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Nonsoftware License Arrangement [Member] | Stem Cell Therapeutics [Member]
Deferred Revenue Arrangement [Line Items]
Number of year up front license fee being amortized	12 years
Unamortized amount of deferred revenue	$ 63,000