Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 AquaBounty	Mar. 15, 2013 AquaBounty
Commitment And Contingencies [Line Items]
Rent expenses	$ 1,362	$ 1,273
Rental income under sublease agreement	91	91
Future rental income for the sublease agreement in 2014	337
Future rental income for the sublease agreement in 2015	281
Future rental income for the sublease agreement in 2016	132
Future rental income for the sublease agreement in 2017	11
Amount available under the grant for Research and Development				2,685
Claims period				5 years
Royalty on products				10.00%
Amount claimed					1,952
Amount claimed fair value					1,107
Long term debt	1,784		1,653	1,784
Accreted difference between face value of amount drawn and acquisition date fair value				845
Subsequent claims of financial grant				648
AquaBounty funding				$ 2,680
Percentage of royalty on revenues				5.20%