Senior Secured Convertible Notes - Additional Information (Detail) (USD $)	0 Months Ended					0 Months Ended
	Apr. 10, 2013 Investor	Mar. 31, 2014 Convertible Option Liability [Member]	Dec. 31, 2013 Convertible Option Liability [Member]	Mar. 31, 2014 Warrant Liability [Member]	Dec. 31, 2013 Warrant Liability [Member]	Apr. 10, 2013 Director [Member]	Apr. 10, 2013 Legal and Other Consulting Fees [Member]
Debt Instrument [Line Items]
Number of investors included in purchase agreement	2
Purchase of notes and warrants by investors	$ 5,000,000
Subordinated secured convertible notes percentage	7.00%
Stock payments discount rate	7.00%
Number of days for Stock payments	20 days
Due date of secured notes	Apr. 10, 2015
Common stock initial conversion ratio principal amount	$ 2.01
Option to force conversion rate	200.00%
Option to force conversion date	90 days
Debt discount, Amortized	1,400,000
Warrants issued to purchase common stock	746,268
Exercise price of common stock	2.01
Term of warrants	5 years
Fair value of warrants, convertible debt discount	768,000
Fair value of liabilities		711,000	550,000	710,000	537,000
Legal and other consulting fees	$ 356,000					$ 127,500	$ 244,000