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Debt (Details) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2021 USD ($) shares | Mar. 02, 2021 USD ($) shares | Oct. 20, 2020 USD ($) | Oct. 16, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 12, 2020 USD ($) | Aug. 09, 2019 USD ($) | Nov. 01, 2018 USD ($) $ / shares | Jul. 26, 2018 USD ($) | Nov. 07, 2017 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Nov. 30, 2020 USD ($) shares | Oct. 31, 2020 USD ($) shares | Aug. 31, 2020 USD ($) shares | Jun. 30, 2020 USD ($) shares | Aug. 31, 2019 USD ($) $ / shares | Aug. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Aug. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jun. 30, 2014 USD ($) $ / shares | Jul. 31, 2013 USD ($) $ / shares | Jun. 30, 2017 USD ($) shares | Jun. 30, 2017 USD ($) shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Feb. 09, 2021 $ / shares | Feb. 05, 2021 USD ($) | Aug. 09, 2020 $ / shares | Jul. 09, 2020 $ / shares | Feb. 09, 2019 $ / shares | Aug. 01, 2018 USD ($) | Jun. 14, 2018 USD ($) | Mar. 31, 2017 USD ($)
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 34,134,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,134,000 | $ 52,658,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (13,205,000) | $ (453,000) |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  |  |  | $ 0.001 |  |  |  |
Paid-in-Kind Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,366,000 | $ 1,725,000 | 0 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,212,000 |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,265,000) | (5,112,000) | 2,948,000 |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 | 1,077,000 | 0 |  |  |  |  |  |  |  |  |
3.25% Convertible Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 34,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,100,000 | 50,800,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.647 |  | $ 5.647 | $ 10.00 | $ 1.00 |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares |  | 177,085 | 177,085 |  |  |  |  |  |  |  |  | 177,085 | 708,340 | 354,170 | 177,085 | 710,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid in-kind |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Market Price Trigger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  | $ 1,000,000.0 | $ 1,000,000.0 |  |  |  |  |  |  |  |  | $ 1,000,000.0 | $ 4,000,000.0 | $ 2,000,000.0 | $ 1,000,000.0 | $ 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-Kind Interest |  | $ 42,516 | $ 42,009 |  |  |  |  |  |  |  |  | 36,528 | 138,248 | 63,225 | 27,288 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 | 5,400,000 | 2,600,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.25% Convertible Senior Notes (due 2018) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.25% |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  | $ 21,600,000 |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 114.3674 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Incremental Value of Principal Converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000.0 | $ 12,000,000.0 |  |  |  | $ 6,100,000 |  |  |  |  |  |  |  | $ 39,100,000
Write off of Deferred Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid cash |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid stock |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid in-kind |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 460,000 | 789,000 |  |  |  |  |  |  |  |  |
3.25% Convertible Senior Notes (due 2020) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 3.25% |  | 4.875% |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  |  | 322.2688 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Incremental Value of Principal Converted |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000.0 | 4,000,000.0 | 2,000,000.0 | 1,000,000.0 | 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-Kind Interest |  |  |  |  |  |  |  |  |  |  |  | 36,528 | $ 138,248 | $ 63,225 | $ 27,288 | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |
4.875% Convertible Senior Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.875% |  |  |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  | 4.875% |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 111,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,000,000.0 |  |  |  |  | $ 115,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103.7613 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Incremental Value of Principal Converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | (2,400,000) |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Original Amount Of Debt Refinanced |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amount Of Accrued Interest Refinanced |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amount Of Debt Exchanged Into A New Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt, Fair Value Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 103,000 |  |  |  |  |  |  |  |  |
Benefit Street Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000.0 |  |  |  |  |  |
Paycheck Protection Program Loan [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly payments |  |  |  |  |  |  | $ 261,275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Current Maturities |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Excluding Current Maturities |  |  |  |  |  |  |  |  |  |  |  | $ 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |  |  |  |  |  |  |  |  |
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] | 3.25% Convertible Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000.0 |  |  | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Principal Amount, Redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,200,000 |  |
Paid-in-Kind Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,300,000) | 2,600,000 |  |  |  |  |  |  |  |  |  |
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] | 3.25% Convertible Senior Notes (due 2020) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  | 393.7008 |  |  |  |  |  |  |  |  |  |  | 328.0302 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Incremental Value of Principal Converted |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 2.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | $ (500,000) | $ (600,000) |  |  |  |  |  | $ (10,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,500,000) | $ 2,900,000 |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | 4.25% Convertible Senior Notes (due 2018) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,600,000 | $ 11,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,240 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | 3.25% Convertible Senior Notes (due 2020) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 177,085 | 708,340 | 354,170 | 177,085 | 710,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 | $ 5,400,000 | $ 2,600,000 | $ 1,300,000 | $ 9,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt [Member] | New Term Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt outstanding | [2] |  |  |  |  |  |  |  |  |  |  | 119,801,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,801,000 | 134,801,000 |  |  |  |  |  |  |  |  |  |
Interest Payable |  |  |  |  |  |  |  |  |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,700,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |
Interest rate if paid cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid in-kind |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-Kind Interest |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 134,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant Compliance, EBITDA Requirment |  |  |  |  |  | $ 34,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant Compliance, Minimum Liquidity |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 15,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |  |  | 124,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 124,500,000 |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Current |  |  |  |  |  |  |  |  |  |  |  | 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Noncurrent |  |  |  |  |  |  |  |  |  |  |  | 114,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 114,800,000 |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000.0 | 400,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  | $ 10,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  |  |  |  |  |  |  |  |  | 129,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,600,000 | 123,400,000 |  |  |  |  |  |  |  |  |  |
Reported Value Measurement [Member] | 3.25% Convertible Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  |  |  |  |  |  | 22,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,900,000 | 37,600,000 |  |  |  |  |  |  |  |  |  |
Interest Payable |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 | $ 400,000 |  |  |  |  |  |  |  |  |  |
Forecast [Member] | Secured Debt [Member] | New Term Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant Compliance, EBITDA Requirment |  |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Pre-payment |  |  |  |  | 15,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast [Member] | Secured Debt [Member] | Payment No Later than Third Quarter 2021 [Member] | New Term Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Pre-payment |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.
[2] | The amount presented excludes accrued, but unpaid, payment-in-kind interest of $4.7 million and $1.3 million as of December 31, 2020 and 2019, respectively.

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