Description of Business and Basis of Presentation - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended		3 Months Ended	9 Months Ended
	Mar. 06, 2013	Jul. 18, 2013	Mar. 12, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Description Of Business And Basis Of Presentation [Line Items]
Common stock, shares issued	3,765,230
Common stock, par value	$ 4.35				$ 0.0001		$ 0.0001
Proceeds from issuance of common stock, net of commissions and other costs of the offering			$ 15,700,000	$ 16,400,000	$ 15,651,000
Gross proceeds from the offering			$ 16,400,000
Reverse Stock Split Ratio Description		Board of Directors of the Company approved a 1-for-30 reverse stock split of the Company's outstanding common stock
Reverse Stock Split Ratio		0.033			0.033
Number of dilutive common shares					0	0
Minimum [Member] | Certificates of Deposit [Member]
Description Of Business And Basis Of Presentation [Line Items]
Certificates of deposit, maturity period					6 months
Maximum [Member] | Certificates of Deposit [Member]
Description Of Business And Basis Of Presentation [Line Items]
Certificates of deposit, maturity period					1 year