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Debt - Senior Notes (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) day | Jun. 30, 2020 USD ($) day $ / shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ 175,120,000 | $ 183,292,000 |  | $ 150,116,000 | $ 170,458,000 | $ 150,116,000 | $ 170,458,000 | $ 158,815,000 | $ 164,436,000 | $ 169,900,000 |  | $ 315,572,000
Long-term debt |  |  |  | 355,067,000 |  | 355,067,000 |  |  |  | 353,564,000 |  |
Cash interest expense |  |  |  | 2,826,000 | 2,814,000 | 8,461,000 | 13,200,000 |  |  |  |  |
Amortization of debt issuance costs |  |  |  | 529,000 | 511,000 | 1,504,000 | 1,671,000 |  |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 875,041,000 | 862,673,000 |  | 943,083,000 | 887,192,000 | 943,083,000 | 887,192,000 | 930,658,000 | 916,191,000 | 903,470,000 |  | 913,115,000
Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ (699,922,000) | (679,382,000) |  | (792,968,000) | $ (716,735,000) | (792,968,000) | (716,735,000) | $ (771,844,000) | $ (751,756,000) | (733,571,000) |  | (597,544,000)
Cumulative effect adjustment |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  | (42,399,000)
Cumulative effect adjustment | Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  | (45,452,000)
Cumulative effect adjustment | Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  | $ 3,053,000
Cumulative effect adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 42,400,000 |
Cumulative effect adjustment | Accounting Standards Update 2020-06 | Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  | (45,500,000) |
Cumulative effect adjustment | Accounting Standards Update 2020-06 | Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 |
Convertible Senior Notes | 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.00% |  |  |  |  |  |  |  |  |
Total issuance costs |  |  | $ 5,700,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discounts and debt issuance costs |  |  | $ 144,300,000 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 146,474,000 |  | $ 146,474,000 |  |  |  | 145,729,000 |  |
Effective interest rate |  |  |  | 5.80% |  | 5.80% |  |  |  |  |  |
Cash interest expense |  |  |  |  |  | $ 5,600,000 | 5,600,000 |  |  |  |  |
Amortization of debt discount and issuance costs |  |  |  |  |  | $ 700,000 | 700,000 |  |  |  |  |
Conversion rate | 0.0793903 |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 12.60 | $ 12.60 |  | $ 12.60 |  |  |  |  |  |
Threshold percentage of stock price trigger for redemption |  |  | 130.00% |  |  |  |  |  |  |  |  |
Period over which default must be cured or waived after notice is given |  |  | 60 days |  |  |  |  |  |  |  |  |
Amount of judgment payments rendered that classify as an event of default |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Discharge or stay period for judgment |  |  | 45 days |  |  |  |  |  |  |  |  |
Percent of the aggregate principal amount due upon event of default |  |  | 25.00% |  |  |  |  |  |  |  |  |
Special interest rate period |  |  | 180 days |  |  |  |  |  |  |  |  |
Special interest rate |  |  | 0.50% |  |  |  |  |  |  |  |  |
Convertible Senior Notes | 2025 Notes | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of long-term debt |  |  |  | $ 140,700,000 |  | $ 140,700,000 |  |  |  |  |  |
Convertible Senior Notes | 2025 Notes | Conversion Condition 1 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger for conversion |  |  | 130.00% |  |  |  |  |  |  |  |  |
Threshold trading days for conversion | day |  |  | 20 |  |  |  |  |  |  |  |  |
Threshold consecutive trading days for conversion | day |  |  | 30 |  |  |  |  |  |  |  |  |
Convertible Senior Notes | 2025 Notes | Conversion Condition 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger for conversion |  |  | 98.00% |  |  |  |  |  |  |  |  |
Threshold consecutive trading days for conversion | day |  |  | 10 |  |  |  |  |  |  |  |  |
Convertible Senior Notes | 2026 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 212,750,000 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 0.75% |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 208,593,000 |  | $ 208,593,000 |  |  |  | $ 207,835,000 |  |
Effective interest rate |  |  |  | 1.30% |  | 1.30% |  |  |  |  |  |
Cash interest expense |  |  |  |  |  | $ 1,200,000 | 900,000 |  |  |  |  |
Conversion rate |  | 0.0358616 |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 27.89 |  | $ 27.89 |  |  |  |  |  |
Threshold percentage of stock price trigger for redemption |  | 130.00% |  |  |  |  |  |  |  |  |  |
Period over which default must be cured or waived after notice is given |  | 60 days |  |  |  |  |  |  |  |  |  |
Percent of the aggregate principal amount due upon event of default |  | 25.00% |  |  |  |  |  |  |  |  |  |
Special interest rate period |  | 180 days |  |  |  |  |  |  |  |  |  |
Special interest rate |  | 0.50% |  |  |  |  |  |  |  |  |  |
Estimated fair value of long-term debt |  |  |  | $ 148,700,000 |  | $ 148,700,000 |  |  |  |  |  |
Debt issuance costs and discount |  | $ 5,700,000 |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of debt |  | $ 207,000,000 |  |  |  |  |  |  |  |  |  |
Threshold trading days for redemption | day |  | 20 |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days for redemption | day |  | 30 |  |  |  |  |  |  |  |  |  |
Cure period |  | 30 days |  |  |  |  |  |  |  |  |  |
Default on debt by the Company or subsidiary that classifies as an Event of Default |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  | $ 800,000 | $ 600,000 |  |  |  |  |
Convertible Senior Notes | 2026 Notes | Conversion Condition 1 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger for conversion |  | 130.00% |  |  |  |  |  |  |  |  |  |
Threshold trading days for conversion | day |  | 20 |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days for conversion | day |  | 30 |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes | 2026 Notes | Conversion Condition 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger for conversion |  | 98.00% |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days for conversion | day |  | 10 |  |  |  |  |  |  |  |  |  |

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