Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended	15 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 AquaBounty	Jun. 30, 2014 AquaBounty	Mar. 15, 2013 AquaBounty
Commitment And Contingencies [Line Items]
Rent expenses	$ 1,361	$ 1,766	$ 2,731	$ 3,039
Rental income under sublease agreement	171	91	262	182
Future rental income for the sublease agreement in 2014	357		357
Future rental income for the sublease agreement in 2015	725		725
Future rental income for the sublease agreement in 2016	384		384
Future rental income for the sublease agreement in 2017	11		11
Amount available under the grant for Research and Development						2,691	2,691
Claims period						5 years
Royalty on products						10.00%
Amount claimed								1,952
Amount claimed fair value								1,107
Long term debt	2,001		2,001		1,653	2,001	2,001
Accreted difference between face value of amount drawn and acquisition date fair value						845	845
Subsequent claims of research and development grant							767
AquaBounty funding						$ 2,778	$ 2,778
Percentage of royalty on revenues						5.20%