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Debt (Details) (USD $)
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Aug. 31, 2012
Summarized information about the term loan [Abstract]        
Less current portion of term loan $ (7,843,000)   $ (7,843,000)  
Long-term portion of term loan 77,640,000   79,434,000  
Future repayments of the Amended Term Loan, by fiscal year [Abstract]        
Total (gain) loss included in net loss (1,114,000) 1,570,000    
Financing Agreement [Member]
        
Maximum amount of capital expenditures by fiscal year [Abstract]        
2015 7,000,000      
2016 4,000,000      
2017 4,000,000      
Financing Agreement [Member] | Term Loans [Member]
        
Debt Instrument [Line Items]        
Maximum borrowing capacity 95,000,000      
Debt instrument, maturity date Nov. 06, 2018      
Maximum amount of equity interests that may be repurchased 10,000,000      
Maximum amount of capital expenditures by fiscal year [Abstract]        
Quarterly principal payments 2,100,000      
Reference interest rate under option 1 LIBOR      
Reference interest rate under option 1, floor (in hundredths) 1.50%      
Interest rate over LIBOR rate under option 1 (in hundredths) 5.25%      
Interest rate above base rate under option 2 (in hundredths) 4.25%      
Interest rate at end of period using LIBOR option (in hundredths) 6.75%   6.75%  
Summarized information about the term loan [Abstract]        
Principal amount of term loan 90,800,000   92,900,000  
Unamortized financing fees (5,317,000)   (5,623,000)  
Net carrying amount of term loan 85,483,000   87,277,000  
Less current portion of term loan (7,843,000)   (7,843,000)  
Long-term portion of term loan 77,640,000   79,434,000  
Future repayments of the Amended Term Loan, by fiscal year [Abstract]        
2015 - remaining nine months 6,300,000      
2016 8,400,000      
2017 8,400,000      
2018 8,400,000      
2019 59,300,000      
Prepayment penalty (in hundredths) 2.00%      
Financing Agreement [Member] | Revolving Facility [Member]
        
Debt Instrument [Line Items]        
Maximum borrowing capacity 30,000,000      
Debt instrument, maturity date Nov. 06, 2018      
Maximum amount of capital expenditures by fiscal year [Abstract]        
Reference interest rate under option 1 LIBOR      
Interest rate over LIBOR rate under option 1 (in hundredths) 2.50%      
Interest rate above base rate under option 2 (in hundredths) 1.00%      
Interest rate at end of period using LIBOR option (in hundredths) 2.66%   2.66%  
Future repayments of the Amended Term Loan, by fiscal year [Abstract]        
Outstanding balance under revolving loan 10,000,000   10,000,000  
Amount available under revolving facility 28,607,000      
Financing Agreement [Member] | Revolving Facility [Member] | Letter of Credit [Member]
        
Debt Instrument [Line Items]        
Maximum borrowing capacity 10,000,000      
Financing Agreement [Member] | Revolving Facility [Member] | Commercial Letter Of Credit [Member]
        
Future repayments of the Amended Term Loan, by fiscal year [Abstract]        
Outstanding balance under revolving loan 917,000      
Financing Agreement [Member] | Revolving Facility [Member] | Standby Letters of Credit [Member]
        
Future repayments of the Amended Term Loan, by fiscal year [Abstract]        
Outstanding balance under revolving loan 476,000      
Financing Agreement [Member] | First Amendment [Member] | Revolving Facility [Member]
        
Debt Instrument [Line Items]        
Maximum borrowing capacity 40,000,000      
Increase (decrease) in maximum borrowing capacity 10,000,000      
WX Agreement [Member] | Supplier Warrant [Member]
        
Future repayments of the Amended Term Loan, by fiscal year [Abstract]        
Number of shares that can be purchased under warrants (in shares)       516,129
Initial exercise price (in dollars per share)       $ 7.75
Fair value of warrants issued 8,933,000   10,047,000  
Total (gain) loss included in net loss $ (1,114,000) $ 1,140,000