Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended				12 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Sweden	Dec. 31, 2012 Sweden	Mar. 31, 2013 Maximum	Mar. 31, 2013 Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]
Income (loss) before income taxes	$ 3,622,068		$ 1,285,379
Income tax provision	1,283,832		58,907
Effective tax rate	35.45%		4.58%
Expected effective tax rate	28.21%
Discrete items recognized	298,000
Effective statutory tax rate				22.00%	26.30%
Net operating loss carryforwards							44,678,000
Business tax credit carryforwards							2,160,000
Net operating loss and business tax credit carry forwards expiration date						At various dates through December 2032
Reversed of deferred tax asset valuation allowance	$ 767,000	$ 3,021,000