Subsequent Events - Additional Information (Detail) (USD $)				0 Months Ended		6 Months Ended	0 Months Ended
	Jun. 30, 2013	Dec. 31, 2012		Aug. 14, 2013 Private Placement Warrant	Aug. 14, 2013 Private Placement Warrant Maximum	Jun. 30, 2013 Hercules Technology Growth Capital Inc	Aug. 07, 2013 Hercules Technology Growth Capital Inc Subsequent Event
Subsequent Event [Line Items]
Subscription agreements, private placement (in units)					8,348,471
Private placement, unit price				$ 0.85
Warrants sold to purchase of additional common stock				8,348,471
Private placement, additional purchase warrants				1
Exercise price of warrants , per share				1.00
Gross proceeds from private placement				$ 7,100,000
Private placement, issuance cost rate				10.00%
Private placement, issuance cost				700,000
Private placement gross proceeds amount investor to withdraw investment without penalty or interest				8,000,000
Percentage of investers agreed to waive option				94.00%
Warrants exercise term (in years)				4 years
Warrants exercise holding period after issuance date (in months)				6 months
Decrease in earning per share due to issuance of additional shares				$ (0.01)
Placement agent cash compensation percentage of gross proceeds from private placement				10.00%
Warrants to be issued to agent as bonus if sale exceeded $5 million				1,000,000
Common stock to be issued to agent as bonus if sale exceeded $5 million				1,000,000
Private placement threshold to agent bonus				5,000,000
Reimbursement of legal fees and expenses				50,000
Equity financing to raise							6,000,000
Common stock, par value	$ 0.001	$ 0.001	[1]				$ 0.001
Dividend						$ 706,364
Exercise price description							The Exercise Price is defined in the warrant as the lowest of (a) $0.712, the closing price of the Common Stock on NASDAQ on August 6, 2013, (b) $0.81, the VWAP measured over the thirty (30) Business Day period ending August 6, 2013), or (c) the effective price per share in the equity raise described in the Third Amendment, per share.

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2012 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.