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Principal Industry (Details) - USD ($)
12 Months Ended
Sep. 10, 2021
Jun. 02, 2021
Jun. 12, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 26, 2018
Aug. 31, 2017
Principal Industry (Details) [Line Items]                  
Gain on Loan Forgiveness       $ 6,206,000 $ 0 $ 0      
Increase (Decrease) in Other Current Assets       2,100,000 300,000        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       45,332,000 92,693,000 66,286,000 $ 58,205,000    
Net Cash Provided by (Used in) Operating Activities       (5,879,000) 43,567,000 21,826,000      
Proceeds from Issuance of Long-term Debt       96,306,000 0 $ 27,356,000      
Long-term Debt       98,505,000          
Letters of Credit Outstanding, Amount       9,800,000          
Closing Fees [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Issuance Costs, Gross   $ 2,200,000              
Other Administrative Fees [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Issuance Costs, Gross   500,000              
Paycheck Protection Program Loan [Member] | Unsecured Debt [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Face Amount     $ 6,200,000            
Debt Instrument, Interest Rate, Stated Percentage     1.00%            
Debt Instrument, Periodic Payment     $ 261,275            
Gain on Loan Forgiveness $ 6,200,000     6,200,000          
JP Morgan ABL Credit Agreement [Member]                  
Principal Industry (Details) [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity   $ 67,500,000              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25%              
Letters of Credit Outstanding, Amount       $ 9,800,000          
JP Morgan ABL Credit Agreement [Member] | Maximum [Member]                  
Principal Industry (Details) [Line Items]                  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.375%              
Fixed Charge Coverage Ratio   1              
JP Morgan ABL Credit Agreement [Member] | Minimum [Member]                  
Principal Industry (Details) [Line Items]                  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25%              
Fixed Charge Coverage Ratio   1.1              
Initial Term Loan [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Face Amount   $ 99,000,000              
Proceeds from Issuance of Long-term Debt   $ 96,300,000              
Debt Instrument, Covenant Description   the Company must maintain a minimum cash balance of not less than $20.0 million. The minimum cash balance can be reduced to $15.0 million in increments of $1.0 million for every $5.0 million in principal repayment of the 2021 BSP Term Loan              
Delayed Draw Term Loan [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Face Amount   $ 19,000,000              
Delayed Draw Term Loan [Member] | Closing Fees [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Issuance Costs, Gross   $ 500,000              
3.25% Convertible Senior Notes Due 2023 [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Face Amount               $ 8,000,000  
Debt Instrument, Interest Rate, Stated Percentage   3.25%   3.25%         3.25%
2021 BSP Term Loan [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Description of Variable Rate Basis   subject to a 1.00% LIBOR floor, or (ii) base rate plus 5.50% - 6.00% (determined by reference to a net leverage pricing grid), subject to a 2.00% base rate floor              
Debt Instrument, Covenant Description   the Company must maintain a minimum cash balance of not less than $20.0 million. The minimum cash balance can be reduced to $15.0 million in increments of $1.0 million for every $5.0 million in principal repayment of the 2021 BSP Term Loan              
Long-term Debt       $ 98,500,000          
2021 BSP Term Loan [Member] | Maximum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   7.00%              
2021 BSP Term Loan [Member] | Minimum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   6.50%              
3.25% Convertible Senior Notes Due 2023 [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   3.25%   3.25%          
Long-term Debt [1]       $ 0 34,134,000        
Outside the United States [Member]                  
Principal Industry (Details) [Line Items]                  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       $ 30,700,000 $ 48,700,000        
London Interbank Offered Rate (LIBOR) [Member] | JP Morgan ABL Credit Agreement [Member] | Maximum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   2.00%              
London Interbank Offered Rate (LIBOR) [Member] | JP Morgan ABL Credit Agreement [Member] | Minimum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   1.50%              
London Interbank Offered Rate (LIBOR) [Member] | Initial Term Loan [Member] | Maximum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   7.00%              
Debt Instrument, Description of Variable Rate Basis   subject to a 1.00% LIBOR floor, or (ii) base rate plus 5.50% - 6.00% (determined by reference to a net leverage pricing grid), subject to a 2.00% base rate floor              
London Interbank Offered Rate (LIBOR) [Member] | Initial Term Loan [Member] | Minimum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   6.50%              
Base Rate [Member] | JP Morgan ABL Credit Agreement [Member] | Maximum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   1.00%              
Base Rate [Member] | JP Morgan ABL Credit Agreement [Member] | Minimum [Member]                  
Principal Industry (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   0.50%              
[1] The amounts presented for the 3.25% convertible senior notes due 2023 within the table represent the fair value as of December 31, 2020 (see Note 16 - Fair Value Measurements). The principal amount of these notes is $22.9 million as of December 31, 2020. The accrued, but unpaid, payment-in-kind interest is $0.9 million as of December 31, 2020.