Management's Plans as to Continuing as a Going Concern (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Dec. 05, 2012 Common Stock	May 03, 2012 Common Stock
Class of Stock
Net cash proceeds from sale of common stock in Initial Public Offering	$ 29,000	$ 29,000	$ 4,000		$ 47,600,000
Net cash proceeds from sale of common stock in a follow-on offering				46,600,000
Draw down under secured credit facility		30,000,000
Cash payment to be received as consideration from sale of equity interest in TCD		27,000,000
Contingent consideration to be received in future from sale of equity interest in TCD		$ 3,000,000
Number of late-stage epilepsy product candidates for which the company will likely revise its commercial plans	2