Debt - Additional Information (Detail) (USD $)			1 Months Ended				1 Months Ended			1 Months Ended						1 Months Ended	3 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Oct. 26, 2012 Horizon	Mar. 31, 2014 Horizon	Dec. 31, 2013 Horizon	Apr. 13, 2011 Horizon	Apr. 13, 2011 Horizon Initial Agreement	Mar. 31, 2014 Horizon Term Loan Credit Facility	Dec. 31, 2013 Horizon Term Loan Credit Facility	Aug. 09, 2013 Neurone	Mar. 31, 2014 Neurone	Dec. 31, 2013 Neurone	Mar. 31, 2014 Neurone Term Loan Credit Facility	Dec. 31, 2013 Neurone Term Loan Credit Facility	Aug. 09, 2013 Neurone Term Loan Credit Facility	Nov. 30, 2012 Venture Bank	Mar. 31, 2014 Venture Bank	Dec. 31, 2013 Venture Bank	Nov. 30, 2012 Venture Bank Prime Rate	Nov. 30, 2012 Venture Bank Minimum	Nov. 30, 2012 Venture Bank Term Loan Credit Facility	Dec. 31, 2013 Venture Bank Term Loan Credit Facility	Nov. 30, 2012 Venture Bank Revolving Credit Facility	Dec. 31, 2013 Venture Bank Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit						$ 5,000,000									$ 500,000						$ 2,500,000		$ 2,000,000
Loan interest rate			11.65%			11.75%				8.00%										5.50%
Loans maturity date			May 01, 2016				Nov. 01, 2014			Aug. 09, 2014											Nov. 30, 2017		Nov. 30, 2013
Loan repayment			5,000,000
Additional borrowings			5,000,000
Fair value of line of credit				8,100,000	9,200,000						500,000	500,000
Line of credit outstanding amount								8,500,000	9,700,000				500,000	500,000								2,200,000		0
Prime rate																Prime rate plus 2.0%
Prime rate percentage																			2.00%
Debt instrument fair value																						2,200,000
Current maturities of long-term debt	3,500,000	5,902,000																2,200,000
Prepayment penalties incurred upon the repayment of debt																	$ 0