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CONVERTIBLE SENIOR NOTES AND CAPPED CALLS - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Nov. 30, 2019 USD ($) | Feb. 28, 2019 USD ($) d $ / shares shares | Jun. 30, 2022 USD ($) | Apr. 01, 2022 USD ($) | Mar. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  |  | $ 745,809,000 |  | $ 766,438,000
Additional paid-in capital |  |  |  | (895,602,000) |  | (956,599,000)
Convertible senior notes, net |  |  |  | 494,444,000 |  | 447,452,000
Convertible Debt | Accounting Standards Update 2020-06 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  |  |  | $ 46,700,000 |
Additional paid-in capital |  |  |  |  | 92,800,000 |
Convertible senior notes, net |  |  |  |  | $ 46,200,000 |
Convertible Debt | Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  | $ 287,500,000 | $ 500,000,000 |  | $ 500,000,000
Debt instrument, interest rate |  |  | 0.50% |  |  |
Net proceeds from issuance of convertible senior notes |  |  | $ 245,800,000 |  |  |
Debt instrument, convertible, conversion ratio |  |  | 0.0389484 |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  |  | $ 0.001 |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  |  | $ 25.68 |  |  |
Debt instrument, convertible, threshold trading days | d |  |  | 20 |  |  |
Debt instrument, convertible, threshold consecutive trading days | d |  |  | 30 |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger |  |  | 130.00% |  |  |
Debt instrument, convertible, measurement period | d |  |  | 5 |  |  |
Debt instrument, convertible, threshold consecutive trading days preceding measurement period | d |  |  | 10 |  |  |
Debt instrument, threshold percentage of sales price per share |  |  | 98.00% |  |  |
Debt instrument, redemption price, percentage |  |  | 100.00% |  |  |
Unamortized debt discount and issuance costs |  |  |  | 19 months |  |
Debt instrument, strike price per share (in dollars per share) | $ / shares |  |  | $ 25.68 |  |  |
Debt instrument, initial cap price per share (in dollars per share) | $ / shares |  |  | $ 39.50 |  |  |
Convertible Debt | Convertible Senior Notes | Call Option |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Option indexed to issuer's equity, indexed shares (in shares) | shares |  |  | 14.1 |  |  |
Convertible Debt | First Additional Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  | $ 75,000,000 |  |  |  |
Debt instrument, interest rate |  | 0.50% |  |  |  |
Net proceeds from issuance of convertible senior notes |  | $ 64,600,000 |  |  |  |
Convertible Debt | Second Additional Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value | $ 137,500,000 |  |  |  |  |
Debt instrument, interest rate | 0.50% |  |  |  |  |
Net proceeds from issuance of convertible senior notes | $ 134,300,000 |  |  |  |  |
Convertible Debt | Aggregate Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value | $ 500,000,000.0 |  |  |  |  |

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