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v3.20.2

Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2020 USD ($) | May 12, 2020 USD ($) | Mar. 06, 2020 USD ($) $ / shares shares | Aug. 09, 2019 USD ($) shares | Sep. 30, 2020 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) Segments $ / shares | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 41,994 |  | $ 41,994 | $ 13,945 |  | $ 12,074 | $ 31,015
Working capital |  |  |  |  | $ 40,700 |  | $ 40,700 |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |
Preferred stock issued during the period |  |  |  |  |  |  | $ 25,000 | 10,000 |  |  |
2022 Notes conversion to equity |  |  |  |  |  |  | 59,907 | 0 |  |  |
Gross proceeds from the issuance of 2025 Notes |  |  |  |  |  |  | 100,000 | 0 |  |  |
Cash paid in exchange transaction |  | $ 32,000 |  |  |  |  | $ 32,062 | $ 0 |  |  |
Number of reportable segments | Segments |  |  |  |  |  |  | 1 |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt conversion amount |  |  |  |  | $ 13,500 |  |  |  |  |  |
Conversion (shares) | shares |  |  |  |  | 1,177,156 |  |  |  |  |  |
Value of converted amount |  |  |  |  | $ 13,500 |  |  |  |  |  |
Convertible Debt | 2022 Notes |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
2022 Notes conversion to equity |  |  |  |  |  | $ 59,900 |  |  |  |  |
Stated interest rate (percent) |  |  |  |  |  | 5.5 |  |  |  |  |
Carrying amount of debt |  | $ 45,000 |  |  | 0 |  | $ 0 |  | $ 2 | $ 105,125 |
Debt conversion amount | $ 2 |  |  |  |  | $ 59,900 |  |  |  |  |
Conversion (shares) | shares |  |  |  |  |  | 13,688,876 |  |  |  |  |
Convertible Debt | 2025 Notes |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (percent) |  | 3.25 |  |  |  |  |  |  |  |  |
Gross proceeds from the issuance of 2025 Notes |  | $ 100,000 |  |  |  |  |  |  |  |  |
Carrying amount of debt |  | 180,400 |  |  | $ 166,898 |  | $ 166,898 |  |  |  |
Debt issued in exchange transaction |  | $ 80,400 |  |  |  |  |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of shares (shares) | shares |  |  | 25,000 | 10,000 |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |
Preferred stock issued during the period |  |  | $ 25,000 | $ 10,000 |  |  |  |  |  |  |

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