1. Warrant liability (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Sep. 30, 2013	Jun. 30, 2013
Warrant liability - fair value measurements using significant unobservable inputs (Level 3)
Balance, beginning	$ 11,921	$ 5,276
Change in fair value of warrant liability included in earnings	7,376	6,645
Balance, ending	$ 19,297	$ 11,921

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

No definition available.

Name:	us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant