Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended				6 Months Ended					6 Months Ended	12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Maximum	Dec. 31, 2013 Scenario, Forecast	Jun. 30, 2013 Available to Reduce Future Federal Income Taxes	Jun. 30, 2013 Sweden	Dec. 31, 2012 Sweden
Income Taxes [Line Items]
Income before income taxes	$ 6,033,703			$ 1,778,193	$ 9,655,771	$ 3,063,572
Income tax provision	1,494,516			208,230	2,778,348	267,137
Expected effective tax rate								25.69%
Discrete items recognized		298,000
Effective statutory tax rate										22.00%	26.30%
Effective tax rate				8.72%		8.72%
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			$ 3,021,000