Subsequent Event Additional Informaton (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Merger Consideration	$ 1.05
Description Of Appraisal Rights Exercised	there not being holders of more than 5% of the shares of common stock of the Company with respect to which appraisal rights have been properly exercised.
Termination Fee To Be Paid To Parent	1,500,000
Reimburse Of Out Of Packet Fee To Parent	1,250,000
Termination Fee To Be Received From Parent	$ 1,500,000
Percentage Of Voting Power On Merger	22.30%