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Convertible Senior Notes - Net proceeds (Details) $ / shares in Units, shares in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
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Jul. 01, 2020 shares | Jun. 10, 2020 USD ($) | May 18, 2020 USD ($) D $ / shares | May 31, 2020 USD ($) D $ / shares shares | Sep. 30, 2019 USD ($) D $ / shares | Mar. 31, 2019 $ / shares shares | Mar. 31, 2018 USD ($) | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 USD ($) | Jun. 05, 2020 | May 29, 2020 USD ($) | Dec. 31, 2019 USD ($)
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 9.50% | 9.50% |  |  |  |
Net proceeds |  | $ 25,000,000.0 |  |  |  |  |  |  | $ 27,678,000 | $ 25,609,000 |  |  |
Aggregate consideration |  |  |  |  |  |  |  |  | 90,238,000 |  |  |  |
Conversion of notes through common stock issuance | shares | 16.0 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes, net |  |  |  |  |  |  |  |  | 205,100,000 |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  | $ 13,222,000 | 13,222,000 |  |  |  |
Closing price of the company's stock | $ / shares |  |  |  |  |  | $ 2.35 |  |  |  |  |  |  |
Common stock shares issued | shares |  |  |  |  |  | 10.0 |  |  |  |  |  |  |
3.75% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 200,000,000.0 |  |  |  |  | 212,463,000 | 212,463,000 |  |  | $ 12,500,000 |
Interest rate (as a percent) |  |  | 3.75% |  |  |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  |  |  |  |  | 12,400,000 |  |  |  |
Maturity principal amount |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Conversion rates for the notes (in shares) |  |  | 198.6196 |  |  |  |  |  |  |  |  |  |
Conversion price, per share | $ / shares |  |  | $ 5.03 |  |  |  |  |  |  |  |  |  |
Trading days | D |  |  | 20 |  |  |  |  |  |  |  |  |  |
Consecutive trading days | D |  |  | 30 |  |  |  |  |  |  |  |  |  |
Conversion price (as a percent) |  |  | 130.00% |  |  |  |  |  |  |  |  |  |
Number of business days |  |  | 5 days |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  |  | 5 days |  |  |  |  |  |  |  |  |  |
Principal amount (as a percent) |  |  | 98.00% |  |  |  |  |  |  |  |  |  |
Percentage of principal amount to be redeemed |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Carrying amount of the liability component |  |  | $ 75,200,000 |  |  |  |  |  |  |  |  |  |
Carrying amount of the equity component |  |  | $ 130,300,000 |  |  |  |  | $ 130,249,000 | 130,249,000 |  |  |  |
Effective interest rate (as a percent) |  |  | 29.00% |  |  |  |  |  |  |  |  |  |
Transaction costs for issuance |  |  | $ 7,000,000.0 |  |  |  |  |  |  |  |  |  |
Initial purchasers' discount |  |  | 6,400,000 |  |  |  |  |  |  |  |  |  |
Other issuance costs |  |  | 600,000 |  |  |  |  |  | $ 4,400,000 |  |  |  |
Transaction costs attributable to the liability component |  |  | 2,600,000 |  |  |  |  |  |  |  |  |  |
Transaction costs attributable to the equity component |  |  | 4,400,000 |  |  |  |  |  |  |  |  |  |
Closing price of the company's stock | $ / shares |  |  |  |  |  |  |  | $ 8.21 | $ 8.21 |  |  |  |
Fair value of convertible senior notes |  |  |  |  |  |  |  | $ 339,000,000.0 | $ 339,000,000.0 |  |  |  |
3.75% Convertible Senior Notes | Level 3 | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility assumption |  |  |  |  |  |  |  | 75 | 75 |  |  |  |
7.5% Convertible Senior Note |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 100,000,000 | $ 40,000,000.0 |  |  | $ 48,000,000 | $ 48,000,000 |  |  |  | $ 48,000,000
Interest rate (as a percent) |  |  |  |  | 7.50% |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  | $ 39,100,000 |  |  |  |  |  |  |  |
Conversion of notes through common stock issuance | shares | 16.0 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount to be repaid at maturity |  |  |  |  | 120.00% |  |  |  |  |  |  |  |
Maturity principal amount |  |  |  |  | $ 48,000,000.0 |  |  |  |  |  |  |  |
Conversion rates for the notes (in shares) |  |  |  |  | 387.5969 |  |  |  |  |  |  |  |
Conversion price, per share | $ / shares |  |  |  |  | $ 2.58 |  |  |  |  |  |  |  |
Consecutive trading days | D |  |  |  |  | 20 |  |  |  |  |  |  |  |
Conversion price (as a percent) |  |  |  |  | 175.00% |  |  |  |  |  |  |  |
Initial purchasers' discount |  |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |
Unamortized debt discount and issuance costs |  |  |  |  | 1,000,000.0 |  |  |  |  |  |  |  |
Closing price of the company's stock | $ / shares |  |  |  |  |  |  |  | $ 8.21 | $ 8.21 |  |  |  |
Fair value of convertible senior notes |  |  |  |  |  |  |  | $ 131,400,000 | $ 131,400,000 |  |  |  | 53,500,000
7.5% Convertible Senior Note | Level 3 | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility assumption |  |  |  |  |  |  |  | 75 | 75 |  |  |  |
7.5% Convertible Senior Note | Holder may require redemption |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | 40,000,000.0 |  |  |  |  |  |  |  |
Maturity principal amount |  |  |  |  | $ 48,000,000.0 |  |  |  |  |  |  |  |
Consecutive trading days | D |  |  |  |  | 5 |  |  |  |  |  |  |  |
Principal amount of the repurchased Convertible Senior Notes(as a percent) |  |  |  |  | 115.00% |  |  |  |  |  |  |  |
Principal amount (as a percent) |  |  |  |  | 110.00% |  |  |  |  |  |  |  |
Conversion ratio, principal amount |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
7.5% Convertible Senior Note | Company may redeem with the consent of the holder |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity principal amount |  |  |  |  | $ 48,000,000.0 |  |  |  |  |  |  |  |
Consecutive trading days | D |  |  |  |  | 5 |  |  |  |  |  |  |  |
Principal amount of the repurchased Convertible Senior Notes(as a percent) |  |  |  |  | 105.00% |  |  |  |  |  |  |  |
Principal amount (as a percent) |  |  |  |  | 115.00% |  |  |  |  |  |  |  |
Conversion ratio, principal amount |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 100,000,000 | $ 1,000,000 |  |  | $ 100,000,000 | $ 33,660,000 | $ 33,660,000 |  |  |  | 100,000,000
Interest rate (as a percent) |  |  | 5.50% | 5.50% |  |  | 5.50% |  |  |  | 5.50% |  |
Net proceeds |  |  |  |  |  |  | $ 52,356,000 |  |  |  |  |  |
Repurchase of convertible senior notes | shares |  |  |  | 9.4 |  |  |  |  |  |  |  |  |
Aggregate repurchase of debt |  |  |  | $ 128,900,000 |  |  |  |  |  |  |  |  |
Aggregate consideration |  |  |  | 90,200,000 |  |  |  |  |  |  |  |  |
Debt component of debt exchange |  |  |  | 35,500,000 |  |  |  |  |  |  |  |  |
Equity component of debt exchange |  |  |  | $ 93,400,000 |  |  |  |  |  |  |  |  |
Discount rate for fair value of liability |  |  |  | 29.80% |  |  |  |  |  |  |  |  |
Long-term borrowings |  |  |  | $ 48,700,000 |  |  |  | $ 33,700,000 | 33,700,000 |  |  |  |
Maturity principal amount |  |  |  | 66,300,000 |  |  |  |  |  |  |  |  |
Gain on early debt extinguishment |  |  |  | $ 13,200,000 |  |  |  |  |  |  |  |  |
Conversion rates for the notes (in shares) |  |  |  | 436.3002 |  |  |  |  |  |  |  |  |
Conversion price, per share | $ / shares |  |  |  | $ 2.29 |  |  |  |  |  |  |  |  |
Trading days | D |  |  |  | 20 |  |  |  |  |  |  |  |  |
Consecutive trading days | D |  |  |  | 30 |  |  |  |  |  |  |  |  |
Conversion price (as a percent) |  |  |  | 130.00% |  |  |  |  |  |  |  |  |
Number of business days |  |  |  | 5 days |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  |  |  | 5 days |  |  |  |  |  |  |  |  |
Principal amount (as a percent) |  |  |  | 98.00% |  |  |  |  |  |  |  |  |
Ownership interest percentage |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Percentage of principal amount to be redeemed |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Carrying amount of the liability component |  |  |  | $ 58,200,000 |  |  |  |  |  |  |  |  |
Carrying amount of the equity component |  |  |  | $ 37,700,000 |  |  |  |  |  |  |  |  | 37,702,000
Effective interest rate (as a percent) |  |  |  | 16.00% |  |  |  |  |  |  |  |  |
Transaction costs for issuance |  |  |  | $ 4,100,000 |  |  |  |  |  |  |  |  |
Initial purchasers' discount |  |  |  | 3,300,000 |  |  | 3,250,000 |  |  |  |  |  |
Other issuance costs |  |  |  | 900,000 |  |  | $ 894,000 |  | $ 1,700,000 |  |  |  |
Transaction costs attributable to the liability component |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |
Transaction costs attributable to the equity component |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |
Closing price of the company's stock | $ / shares |  |  |  |  |  |  |  | $ 8.21 | $ 8.21 |  |  |  |
Fair value of convertible senior notes |  |  |  |  |  |  |  | $ 120,900,000 | $ 120,900,000 |  |  |  | $ 135,300,000
5.5% Convertible Senior Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption notice days |  |  |  | 1 day |  |  |  |  |  |  |  |  |
5.5% Convertible Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption notice days |  |  |  | 3 days |  |  |  |  |  |  |  |  |
5.5% Convertible Senior Notes | Level 3 | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility assumption |  |  |  |  |  |  |  | 75 | 75 |  |  |  |

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