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FINANCING ARRANGEMENTS - 3.25% Convertible Senior Notes due 2022 (Details) |  | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Apr. 30, 2016 USD ($) $ / shares | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | $ 65,620,000 |  |  | $ 107,674,000 | $ 191,507,000 |  | $ 395,046,000 |
Additional Paid-In Capital |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | 2,261,095,000 |  |  | 2,348,114,000 | 2,323,217,000 | [1] | 2,310,393,000 | [1]
Accumulated Deficit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | (1,258,283,000) |  |  | (1,320,886,000) | $ (1,246,477,000) |  | (1,032,876,000) |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  | (18,969,000) |  |  | (79,000) |
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  | (67,014,000) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  | 48,045,000 |  |  | $ (79,000) |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Non-current liabilities |  |  | $ 19,000,000.0 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional Paid-In Capital |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | (67,000,000.0) |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Accumulated Deficit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ 48,000,000.0 |  |  |  |  |
3.25% Convertible Senior Notes due 2022 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  | 3.25% |  |  |  |  |  |
Principal amount | 250,000,000 | $ 250,000,000.0 |  | 250,000,000 |  |  |  |
Net proceeds from issuance of debt |  | $ 243,200,000 |  |  |  |  |  |
Debt conversion ratio |  | 0.00925926 |  |  |  |  |  |
Conversion price (in usd per share) | $ / shares |  | $ 108.00 |  |  |  |  |  |
Debt related commitment fees and issuance costs |  | $ 6,800,000 |  |  |  |  |  |
Debt issuance costs | $ 0 | $ 4,800,000 |  | 19,051,000 |  |  |  |
Effective interest rate | 3.76% | 9.75% |  |  |  |  |  |
Equity component of convertible debt |  | $ 2,000,000.0 |  |  |  |  |  |
Estimated fair value of convertible notes | $ 262,200,000 |  |  | $ 263,300,000 |  |  |  |
Debt remaining term | 1 year |  |  |  |  |  |  |
[1] | All share information and balances have been retroactively adjusted to reflect a reverse stock split. See Note 7, Stockholders' Equity and Compensation Arrangements, for additional information.

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