Line of credit facility (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended	1 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2011 Laddcap Value Partners Iii Llc [Member]	Apr. 12, 2011 Laddcap Value Partners Iii Llc [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 500
Line of Credit Facility, Commitment Fee Percentage		2.00%
Line of Credit Facility, Interest Rate at Period End		8.00%
Line Of Credit Facility, Accrued Commitment Fee	$ 10	$ 6
Percentage Of Beneficial Owned	10.00%
Line Of Credit Facility Term			15 months

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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