Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Common Share - Reconciliation of Numerator and Denominator (Detail)

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Net Income (Loss) Per Common Share - Reconciliation of Numerator and Denominator (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) - basic $ 1,176 $ (991) $ (20,826) $ (99,523)
Less: noncash income from change in fair value of common stock warrants (6,379) (2,967) (557)  
Net loss - diluted $ (5,203) $ (3,958) $ (21,383) $ (99,523)
Denominator:        
Weighted average common shares outstanding 58,542 55,654 57,362 53,516
Dilutive effect of warrants 5,019 8,751 2,509  
Weighted-average common shares outstanding and potential dilutive common shares - diluted 63,561 64,405 59,871 53,516
Net income (loss) per share        
Basic $ 0.02 $ (0.02) $ (0.36) $ (1.86)
Diluted $ (0.08) $ (0.06) $ (0.36) $ (1.86)