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Debt - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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Aug. 07, 2017 USD ($) $ / shares | Jul. 31, 2014 $ / shares $ / Item | Jul. 31, 2014 $ / shares $ / Item | Jan. 31, 2013 USD ($) $ / shares $ / Item shares | Mar. 31, 2022 USD ($) $ / shares $ / Item | Mar. 31, 2021 USD ($) $ / shares | Dec. 31, 2021 USD ($) | Mar. 07, 2022 USD ($) | Jan. 01, 2022 | Aug. 01, 2017 $ / shares | Dec. 31, 2016 USD ($)
Debt |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |  |  | $ 15,277 | $ 36,403 |  |  |  |  |
Liability component |  |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | 549,707 |  | $ 433,484 |  |  |  |
Debt discount and issuance costs, net |  |  |  |  | $ (10,960) |  | (38,831) |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  |  | 67,300 |  |  |  |
Common stock price to current conversion price ratio |  |  |  |  | 130.00% |  |  |  |  |  |
Average trading price percentage |  |  |  |  | 98.00% |  |  |  |  |  |
Total issuance costs |  |  |  |  |  |  | 5,400 |  |  |  |
Liability issuance costs |  |  |  |  |  |  | 3,500 |  |  |  |
Equity issuance costs |  |  |  |  |  |  | $ 1,900 |  |  |  |
Effective interest rate |  |  |  |  |  |  | 8.87% |  |  |  |
2025 Notes | ASU 2020-06 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  | 2.88% |  |
2025 Notes | Common stock |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  |  |  |  | $ 13.28 |
Convertible senior notes | 2025 Notes |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Ratio of repurchase price to the principal amount |  |  |  |  | 100.00% |  |  |  |  |  |
Liability component |  |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 192,500 |  | $ 192,500 |  |  |  |
Debt discount and issuance costs, net |  |  |  |  | (2,437) |  | (38,211) |  |  |  |
Net Carrying Amount |  |  |  |  | 190,063 |  | 154,289 |  |  |  |
Equity component, net |  |  |  |  | 0 |  | 65,361 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | 1,203 | 1,203 |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  | 171 | 159 |  |  |  |  |
Amortization of debt discount |  |  |  |  | 0 | 1,911 |  |  |  |  |
Total interest and amortization expense |  |  |  |  | $ 1,374 | $ 3,273 |  |  |  |  |
Convertible senior notes | 2025 Notes | Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Loan amount | $ 17,500 |  |  |  |  |  |  |  |  |  |
Convertible senior notes | 2025 Notes | Private Placement |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Loan amount | $ 192,500 |  |  |  |  |  |  |  |  |  |
Debt Instrument, annual interest rate | 2.50% |  |  |  |  |  |  |  |  |  |
Convertible senior notes | 2025 Notes | Common stock |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Conversion rate for shares of common stock per $1,000 principal | 57.9240 |  |  |  |  |  |  |  |  |  |
Conversion price (dollars per share) | $ / shares | $ 17.26 |  |  |  | $ 17.26 | $ 17.26 |  |  |  |  |
Conversion premium (as a percent) | 30.00% |  |  |  |  |  |  |  |  |  |
Convertible senior notes | 2028 Notes |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  | $ 261,000 |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  | Mar. 15, 2028 |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  |  |  | $ 252,600 |  |  |  |  |  |
Common stock price to current conversion price ratio |  |  |  |  | 130.00% |  |  |  |  |  |
Average trading price percentage |  |  |  |  | 98.00% |  |  |  |  |  |
Ratio of repurchase price to the principal amount |  |  |  |  | 100.00% |  |  |  |  |  |
Portion of debt instrument face amount, Exercised |  |  |  |  | $ 36,000 |  |  |  |  |  |
Effective interest rate |  |  |  |  | 2.69% |  |  |  |  |  |
Liability component |  |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 261,000 |  |  |  |  |  |
Debt discount and issuance costs, net |  |  |  |  | (8,332) |  |  |  |  |  |
Net Carrying Amount |  |  |  |  | 252,668 |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | 346 |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  | 84 |  |  |  |  |  |
Total interest and amortization expense |  |  |  |  | $ 430 |  |  |  |  |  |
Convertible senior notes | 2028 Notes | Privately-negotiated capped call option |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Cap price for the underlying number of shares (in dollars per share) | $ / Item |  |  |  |  | 33.9850 |  |  |  |  |  |
Purchases of capped calls in connection with convertible senior notes due 2028 |  |  |  |  | $ 21,000 |  |  |  |  |  |
Convertible senior notes | 2028 Notes | Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  | $ 45,000 |  |  |  |  |  |
Convertible senior notes | 2028 Notes | Private Placement |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, annual interest rate |  |  |  |  | 2.125% |  |  |  |  |  |
Convertible senior notes | 2028 Notes | Common stock |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Conversion rate for shares of common stock per $1,000 principal |  |  |  |  | 38.1432 |  |  |  |  |  |
Conversion price (dollars per share) | $ / shares |  |  |  |  | $ 26.22 |  |  |  |  |  |
Convertible subordinated notes | Privately-negotiated capped call option |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Cap price for the underlying number of shares (in dollars per share) | $ / Item |  | 27.04 | 27.04 |  |  |  |  |  |  |  |
Convertible subordinated notes | 2023 Notes |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  | $ 287,500 |  |  |  |  |  |  |
Debt Instrument, annual interest rate |  |  |  | 2.125% |  |  |  |  |  |  |
Conversion price (dollars per share) | $ / shares |  | $ 19.77 | $ 19.77 | $ 27.79 |  |  |  |  |  |  |
Ratio of repurchase price to the principal amount |  |  |  |  | 100.00% |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 2.37% |  |  |
Proceeds from issuance of notes payable, net of debt issuance costs |  |  |  | $ 281,200 |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  | $ 144,800 |  |  | $ 144,800 |  |  | $ 14,100
Liability component |  |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | 96,207 |  | 240,984 | 96,200 |  |  |
Debt discount and issuance costs, net |  |  |  |  | 191 |  | 620 | $ (200) |  |  |
Net Carrying Amount |  |  |  |  |  |  | $ 240,364 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | 1,084 | $ 1,280 |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  | 122 | 141 |  |  |  |  |
Total interest and amortization expense |  |  |  |  | $ 1,206 | $ 1,421 |  |  |  |  |
Convertible subordinated notes | 2023 Notes | Privately-negotiated capped call option |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Strike price for the underlying number of shares (in dollars per share) | $ / shares |  | $ 27.79 | $ 19.77 | $ 27.79 |  |  |  |  |  |  |
Cap price for the underlying number of shares (in dollars per share) | $ / Item |  | 38.00 | 38.00 | 38.00 |  |  |  |  |  |  |
Convertible subordinated notes | 2023 Notes | Stock prices below $26.22 per share | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Net shares settlement payable to the entity | shares |  |  |  | 0 |  |  |  |  |  |  |

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