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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Net income (loss) - basic $ (7,745) $ 1,176 $ (15,620) $ (20,826)
Less: noncash income from change in fair value of common stock warrants (1,558) (6,379) (7,781) (557)
Net loss - diluted $ (9,303) $ (5,203) $ (23,401) $ (21,383)
Denominator:        
Weighted average common shares outstanding 59,845 58,542 59,500 57,362
Dilutive effect of warrants 1,649 5,019 3,919 2,509
Weighted-average common shares outstanding and dilutive potential common shares — diluted 61,494 63,561 63,419 59,871
Net income (loss) per share        
Basic $ (0.13) $ 0.02 $ (0.26) $ (0.36)
Diluted $ (0.15) $ (0.08) $ (0.37) $ (0.36)