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Share-based Compensation (Details) (USD $)
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation and consulting expense $ 164,000 $ 132,000
Restricted shares, additional disclosures [Abstract]    
Unrecognized share-based compensation expense 1,326,000  
Unrecognized compensation expense, weighted average period of recognition 2 years 7 months 6 days  
Stock Options [Member]
   
Weighted-average assumptions used to value the options granted [Abstract]    
Expected life in years 4 years 8 months 26 days 5 years 2 months 16 days
Risk free interest rate (in hundredths) 0.82% 1.83%
Expected volatility (in hundredths) 91.44% 90.35%
Expected dividend yield (in hundredths) 0.00% 0.00%
Weighted-average grant date fair value (in dollars per share) $ 2.24 $ 5.37
Stock options, number of shares [Roll Forward]    
Outstanding, beginning of period (in shares) 2,083,000  
Options exercised (in shares) 32,000  
Options surrendered (in shares) (46,000)  
Outstanding, end of period (in shares) 2,069,000  
Exercisable, end of period (in shares) 1,943,000  
Stock options, weighted average exercise price [Roll Forward]    
Outstanding, beginning of period (in dollars per share) $ 3.64  
Options exercised (in dollars per share) $ 3.27  
Options surrendered (in dollars per share) $ 4.36  
Outstanding, end of period (in dollars per share) $ 3.62  
Exercisable, end of period (in dollars per share) $ 3.38  
Stock options, additional disclosures [Abstract]    
Outstanding, weighted average remaining life in years 2 years 9 months 25 days  
Exercisable, weighted average remaining life in years 2 years 4 months 6 days  
Outstanding, aggregate intrinsic value, end of period 2,676,000  
Exercisable, aggregate intrinsic value, end of period 2,770,000  
Fair value of stock options vested 249,000 168,000
Stock Options [Member] | Maximum [Member]
   
Weighted-average assumptions used to value the options granted [Abstract]    
Forfeiture rate (in hundredths) 13.00%  
Stock Options [Member] | Consultants [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation and consulting expense 2,000 1,000
Restricted Stock [Member]
   
Restricted shares, number of shares [Roll Forward]    
Balance, beginning of period (in shares) 70,000  
Shares granted (in shares) 118,000  
Shares vested (in shares) (20,000)  
Balance, end of period (in shares) 168,000  
Restricted shares, weighted average grant date fair value [Roll Forward]    
Balance, beginning of period (in dollars per share) $ 6.30  
Shares granted (in dollars per share) $ 3.67  
Shares vested (in dollars per share) $ 6.09  
Balance, end of period (in dollars per share) $ 4.47  
Restricted shares, additional disclosures [Abstract]    
Weighted average remaining life in years 1 year 7 months 28 days  
Shares vested 127,000  
Balance, end of period $ 750,000  
2006 Amended Stock and Incentive Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of active plans for share-based compensation grants 1  
Number of shares reserved for share-based grants (in shares) 2,700,000  
Shares available for grant (in shares) 1,037,000  
2006 Amended Stock and Incentive Plan [Member] | Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
2006 Amended Stock and Incentive Plan [Member] | Stock Options [Member] | Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term of share-based payment award (in years) 7 years  
2006 Amended Stock and Incentive Plan [Member] | Stock Options [Member] | Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term of share-based payment award (in years) 5 years