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Summary of Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accumulated deficit | $ (986,973) | $ (929,318) |
Convertible Notes |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Amount interest accretion would have been without ASU 2020-06 adoption | 2,300 |  |
Outstanding principle | 287,500 |  |
Net carrying amount | $ 279,471 |  |
Previously reported | Convertible Notes |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Outstanding principle |  | 287,500 |
Unamortized debt discount and issuance cost |  | (85,007) |
Net carrying amount |  | 202,493 |
Additional paid-in-capital |  | (1,411,286) |
Accumulated deficit |  | (929,318) |
ASU 2016-13 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment |  |  | $ 400
Accounting Standards Update 2020-06 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income from continuing operations per common share | $ 0.03 |  |
Accounting Standards Update 2020-06 | Convertible Notes |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Outstanding principle |  | 287,500 |
Unamortized debt discount and issuance cost |  | (8,333) |
Net carrying amount |  | 279,167 |
Additional paid-in-capital |  | (1,328,414) |
Accumulated deficit |  | (923,120) |
Accounting Standards Update 2020-06 | Adoption Adjustment | Convertible Notes |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Unamortized debt discount and issuance cost |  | 76,674 |
Net carrying amount |  | 76,674 |
Additional paid-in-capital |  | 82,872 |
Accumulated deficit |  | $ 6,198 |

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