Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED AWARDS AND PER SHARE INFORMATION - Summary of Option Activity under Stock Option Plans (Detail)

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STOCK-BASED AWARDS AND PER SHARE INFORMATION - Summary of Option Activity under Stock Option Plans (Detail) (USD $)
 9 Months Ended
Sep. 30, 2012
Stock-Based Awards and Per Share Information [Line Items]  
Options outstanding at December 31, 2011, shares 3,858,000
Plus: Options granted, shares 887,000
Less: Options exercised, shares (214,000)
Options forfeited, canceled, or expired, shares (830,000)
Options outstanding at September 30, 2012, shares 3,701,000
Options exercisable at September 30, 2012, shares 2,214,000
Vested options expired during the nine months ended September 30, 2012, shares 355,000
Options outstanding at December 31, 2011, weighted average exercise price $ 3.75
Plus: Options granted, weighted average exercise price $ 2.55
Less: Options exercised, Weighted average exercise price $ 2.12
Options forfeited, canceled or expired, Weighted average exercise price $ 3.58
Options outstanding at September 30, 2012, weighted average exercise price $ 3.58
Options exercisable at September 30, 2012, weighted average exercise price $ 4.17
Vested options expired during the nine months ended September 30, 2012, Weighted average exercise price $ 4.78
Options outstanding at September 30, 2012, Weighted average remaining contractual term (years) 4 years 1 month 6 days
Options exercisable at September 30, 2012,Weighted average remaining contractual term (years) 4 years 1 month 6 days
Options outstanding at September 30, 2012, aggregate intrinsic value $ 158,000
Options exercisable at September 30, 2012, Aggregate intrinsic value $ 157,000