Preferred Stock, Common Stock and Stockholders' Equity - Common Stock - Additional Information (Detail) (USD $)	12 Months Ended		1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2015	Nov. 13, 2014	Nov. 11, 2014
Sale Of Stock [Line Items]
Common stock, shares outstanding	6,112,091	6,096,752
Shareholders voting power description	Each share of common stock is entitled to one vote. The holders of the common stock are also entitled to receive dividends whenever funds are legally available and when declared by the board of directors of the Company.
Dividends declared on common stock	$ 0
Common stock, shares issued	6,112,091	6,096,752
Proceeds from issuance of common stock, net	42,875	25,120,948
Sales Agreement with MLV & Co. LLC [Member]
Sale Of Stock [Line Items]
Common stock, shares outstanding					2,900,000
Common stock, value of shares issuable	6,400,000			6,600,000
Common stock, shares issued	0
Entity public float					20,000,000
Common stock, closing price					$ 6.86
One third value of entity public float					6,600,000
Sales Agreement with MLV & Co. LLC [Member] | Subsequent Event [Member]
Sale Of Stock [Line Items]
Common stock, shares issued			25,000
Common stock , weighted average price per share			$ 6.74
Proceeds from issuance of common stock, net			$ 163,000