Debt - Additional Information (Detail) (USD $)	6 Months Ended		1 Months Ended		1 Months Ended	0 Months Ended						1 Months Ended	6 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Oct. 26, 2012 Horizon	Apr. 13, 2011 Horizon	Apr. 13, 2011 Horizon Initial Agreement	Aug. 09, 2013 Neurone	Jun. 30, 2014 Neurone	Dec. 31, 2013 Neurone	Jun. 30, 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	Jun. 30, 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]
Long-term debt	$ 496,000
Debt Instrument Maturity Year	2015
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												Nov. 30, 2017		Nov. 30, 2013
Loan repayment			5,000,000
Additional borrowings			5,000,000
Debt Instrument, Maturity Date Range, start						Aug. 09, 2014
Debt Instrument, Maturity Date Range, End						Aug. 09, 2015
Fair value of line of credit							500,000	500,000
Line of credit outstanding amount									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		5,902,000												2,200,000
Prepayment penalties incurred upon the repayment of debt													$ 0