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Debt - Long-term Debt (Details) - USD ($)
3 Months Ended 6 Months Ended 19 Months Ended 22 Months Ended 28 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Total principal balance of long-term debt $ 240,684,000   $ 240,684,000   $ 321,448,000   $ 321,448,000
Less: unamortized discount (20,892,000)   (20,892,000)   (57,313,000)   (57,313,000)
Less: unamortized debt issuance costs (222,000)   (222,000)   (289,000)   (289,000)
Total long-term debt 219,411,000   219,411,000   263,523,000   263,523,000
Less: current portion of long-term debt 4,444,000   4,444,000   0   0
Total long-term portion 214,967,000   214,967,000   263,523,000   263,523,000
Noncash interest paid in kind     6,165,000 $ 7,788,000      
3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes Due August 31, 2024              
Debt Instrument [Line Items]              
Second Lien Notes due August 31, 2022 and 2024 96,364,000   96,364,000   0   0
Noncash interest paid in kind     1,229,000        
5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes Due August 31, 2022              
Debt Instrument [Line Items]              
Second Lien Notes due August 31, 2022 and 2024 3,823,000   3,823,000   193,660,000   193,660,000
Noncash interest paid in kind     131,000       28,991,000
Less: unvested restricted Second Lien Notes              
Debt Instrument [Line Items]              
Less: unvested restricted Second Lien Notes (159,000)   (159,000)   0   0
Convertible Senior Secured Paid-In-Kind Toggle Notes Due in 2024              
Debt Instrument [Line Items]              
Less: unvested restricted Second Lien Notes 0   0   (323,000)   (323,000)
Unsecured Forgivable Loan | COVID-19              
Debt Instrument [Line Items]              
Total principal balance of long-term debt 10,000,000   10,000,000   0   0
France Term Loan | COVID-19              
Debt Instrument [Line Items]              
Total principal balance of long-term debt 6,721,000   6,721,000   0   0
Line of Credit | Floating rate Revolving A Credit Facility due February 28, 2022              
Debt Instrument [Line Items]              
Line of credit 96,400,000   96,400,000   102,000,000   102,000,000
Line of Credit | 12.00% Revolving B Credit Facility due February 28, 2022              
Debt Instrument [Line Items]              
Line of credit 27,376,000   27,376,000   25,788,000   25,788,000
Total long-term debt 27,376,000   27,376,000   25,788,000   $ 25,788,000
Noncash interest paid in kind $ 806,000 $ 715,000 $ 1,588,000 $ 1,401,000 $ 4,288,000 $ 5,876,000  
Stated interest rate (as a percent) 12.00%   12.00%