Acquisition of Molecular Profiles Limited - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended
	Sep. 12, 2013	Sep. 30, 2013	Sep. 30, 2013
Business Acquisition [Line Items]
Acquisition related costs		$ 947,202	$ 1,439,946
Molecular Profiles [Member]
Business Acquisition [Line Items]
Cash paid for acquisition of Molecular Profiles	16,700,000
Shares issued to Molecular Profiles stockholders	1,051,323
Purchase price, net	24,900,000		26,511,483
Revenue		600,000
Acquisition date			Sep. 12, 2013
Acquisition related costs		$ 900,000	$ 1,000,000