Reverse stock split (Details)	6 Months Ended
Jun. 30, 2012
Reverse stock split [Abstract]
Reverse stock split conversion ratio	16.67%

Stockholders Equity Note Reverse Stock Split Conversion Ratio

No definition available.

Name:	vcra_StockholdersEquityNoteReverseStockSplitConversionRatio
Namespace Prefix:	vcra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration