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LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENT - Common Stock Warrant Liability (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 12, 2021 USD ($) | May 13, 2016 $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Class of Warrant or Right [Line Items] |  |  |  |
Expected contractual term |  |  | 5 years 4 months 13 days | 6 years 4 months 13 days
Fair Value Adjustment of Warrants |  |  | $ 598 | $ 1,230
Measurement Input, Price Volatility |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Expected stock rate |  |  | 0.6460 | 0.4687
Measurement Input, Expected Dividend Rate |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Expected stock rate |  |  | 0 | 0
Measurement Input, Risk Free Interest Rate |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Expected stock rate |  |  | 0.0042 | 0.0179
Line of Credit | Second Lien Term Loan | Warrant to Purchase Common Equity |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants issued (in shares) | shares |  | 1,006,568 |  |
Warrant exercise price (in dollars per share) | $ / shares |  | $ 1.67 |  |
Other Nonoperating Expense |  |  | $ 600 | $ 1,200
Line of Credit | Second Lien Term Loan | Warrant to Purchase Common Equity | Subsequent Event |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Expected Repurchase Price, Warrants | $ 6,000 |  |  |
Payments for Repurchase of Warrants | $ 4,000 |  |  |
Warrants Repurchased Discount Rate Of Closing Price, Percentage | 34.00% |  |  |

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- Definition The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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