Description of business and summary of significant accounting policies - Concentration of Credit Risk (Details) (USD $)	Mar. 31, 2013
Accounting Policies [Abstract]
Cash, Uninsured Amount	$ 362,737
Cash, FDIC Insured Amount	$ 250,000

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant