Income Taxes (Detail) (USD $)	12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Domestic Tax Authority [Member]	Dec. 31, 2011 State and Local Jurisdiction [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	34.00%
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ (19,000,000)
Deferred Tax Assets, Operating Loss Carryforwards, State and Local		(60,700,000)
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration			5,400,000	1,200,000
Operating Loss Carryforwards, Subject To Limitations Within the Next Five Years on Use			400,000
Operating Loss Carryforwards, Subject To Limitations For The Following Fifteen Years on Use			200,000
Operating Loss Carryforwards, Subject To Limitations For The Next Twenty Years on Use				100,000
Deferred Tax Assets, Tax Credit Carryforwards, Research and Development				2,400,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 200,000	$ 0.1