Summary of significant accounting policies (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	May 28, 2012	Dec. 31, 2011	Sep. 30, 2012 Accounts Receivable [Member] Credit Concentration Risk [Member]	Dec. 31, 2011 Accounts Receivable [Member] Credit Concentration Risk [Member]	Sep. 30, 2012 Energizer Holdings, Inc. [Member]	Sep. 30, 2011 Energizer Holdings, Inc. [Member]	Sep. 30, 2012 Energizer Holdings, Inc. [Member]	Sep. 30, 2011 Energizer Holdings, Inc. [Member]
Revenue, Major Customer [Line Items]
Percentages of total net sales									13.40%	21.10%	16.10%	20.00%
Concentration Risk [Line Items]
Percentage of accounts receivable							36.30%	25.00%
Deferred Revenue
Deferred government grants					$ 655,446
Loss per share of common stock attributable to the Company
Anti-dilutive securities excluded from calculation	727,500	637,500	727,500	637,500
Derivatives
Fair value balance of foreign currency derivative assets	$ 113,402		$ 113,402			$ 15,653