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Consolidated Statements of Shareholders' Equity (unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2020 |  |  | 102,763 |  |  |  |  |
Balance at Dec. 31, 2020 | $ 275,884 |  | $ 1,028 | $ 2,105,252 |  | $ (1,830,589) |  | $ 193
Comprehensive loss: |  |  |  |  |  |  |  |
Net loss | (208,962) |  |  |  |  | (208,962) |  |
Other comprehensive income (loss) | 231 |  |  |  |  |  |  | 231
Exercise of stock options and ESPP shares issuance (in shares) |  |  | 760 |  |  |  |  |
Exercise of stock options and ESPP shares issuance | 13,525 |  | $ 7 | 13,518 |  |  |  |
Net proceeds from issuance of common stock (in shares) |  |  | 11,500 |  |  |  |  |
Equity component of convertible debt redemption | 269,886 |  | $ 115 | 269,771 |  |  |  |
Equity component of convertible debt issuance | 196,063 |  |  | 196,063 |  |  |  |
Equity component of convertible debt redemption | (37,846) |  |  | (37,846) |  |  |  |
Issuance of common stock for vesting of RSUs (in shares) |  |  | 216 |  |  |  |  |
Issuance of common stock for vesting of RSUs | 2 |  | $ 2 |  |  |  |  |
Stock-based compensation expense | 22,270 |  |  | 22,270 |  |  |  |
Balance (in shares) at Jun. 30, 2021 |  |  | 115,239 |  |  |  |  |
Balance at Jun. 30, 2021 | 531,053 |  | $ 1,152 | 2,569,028 |  | (2,039,551) |  | 424
Balance (in shares) at Dec. 31, 2020 |  |  | 102,763 |  |  |  |  |
Balance at Dec. 31, 2020 | 275,884 |  | $ 1,028 | 2,105,252 |  | (1,830,589) |  | 193
Balance (in shares) at Dec. 31, 2021 |  |  | 118,738 |  |  |  |  |
Balance at Dec. 31, 2021 | $ 410,468 | $ (214,410) | $ 1,187 | 2,673,556 | $ (264,609) | (2,265,243) | $ 50,199 | 968
Comprehensive loss: |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2020-06 |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2021 |  |  | 103,279 |  |  |  |  |
Balance at Mar. 31, 2021 | $ 201,636 |  | $ 1,033 | 2,122,743 |  | (1,922,230) |  | 90
Comprehensive loss: |  |  |  |  |  |  |  |
Net loss | (117,321) |  |  |  |  | (117,321) |  |
Other comprehensive income (loss) | 334 |  |  |  |  |  |  | 334
Exercise of stock options and ESPP shares issuance (in shares) |  |  | 344 |  |  |  |  |
Exercise of stock options and ESPP shares issuance | 6,565 |  | $ 3 | 6,562 |  |  |  |
Net proceeds from issuance of common stock (in shares) |  |  | 11,500 |  |  |  |  |
Equity component of convertible debt redemption | 269,886 |  | $ 115 | 269,771 |  |  |  |
Equity component of convertible debt issuance | 196,063 |  |  | 196,063 |  |  |  |
Equity component of convertible debt redemption | (37,846) |  |  | (37,846) |  |  |  |
Issuance of common stock for vesting of RSUs (in shares) |  |  | 116 |  |  |  |  |
Issuance of common stock for vesting of RSUs | 1 |  | $ 1 |  |  |  |  |
Stock-based compensation expense | 11,735 |  |  | 11,735 |  |  |  |
Balance (in shares) at Jun. 30, 2021 |  |  | 115,239 |  |  |  |  |
Balance at Jun. 30, 2021 | 531,053 |  | $ 1,152 | 2,569,028 |  | (2,039,551) |  | 424
Balance (in shares) at Dec. 31, 2021 |  |  | 118,738 |  |  |  |  |
Balance at Dec. 31, 2021 | 410,468 | $ (214,410) | $ 1,187 | 2,673,556 | $ (264,609) | (2,265,243) | $ 50,199 | 968
Comprehensive loss: |  |  |  |  |  |  |  |
Net loss | (190,266) |  |  |  |  | (190,266) |  |
Other comprehensive income (loss) | (1,897) |  |  |  |  |  |  | (1,897)
Exercise of stock options and ESPP shares issuance (in shares) |  |  | 795 |  |  |  |  |
Exercise of stock options and ESPP shares issuance | 13,260 |  | $ 8 | 13,252 |  |  |  |
Issuance of common stock for vesting of RSUs (in shares) |  |  | 332 |  |  |  |  |
Issuance of common stock for vesting of RSUs | 4 |  | $ 4 |  |  |  |  |
Stock-based compensation expense | 27,082 |  |  | 27,082 |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  | 119,865 |  |  |  |  |
Balance at Jun. 30, 2022 | $ 44,241 |  | $ 1,199 | 2,449,281 |  | (2,405,310) |  | (929)
Comprehensive loss: |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2020-06 |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2022 |  |  | 119,346 |  |  |  |  |
Balance at Mar. 31, 2022 | $ 119,880 |  | $ 1,193 | 2,428,582 |  | (2,309,665) |  | (230)
Comprehensive loss: |  |  |  |  |  |  |  |
Net loss | (95,645) |  |  |  |  | (95,645) |  |
Other comprehensive income (loss) | (699) |  |  |  |  |  |  | (699)
Exercise of stock options and ESPP shares issuance (in shares) |  |  | 345 |  |  |  |  |
Exercise of stock options and ESPP shares issuance | 6,444 |  | $ 4 | 6,440 |  |  |  |
Issuance of common stock for vesting of RSUs (in shares) |  |  | 174 |  |  |  |  |
Issuance of common stock for vesting of RSUs | 2 |  | $ 2 |  |  |  |  |
Stock-based compensation expense | 14,259 |  |  | 14,259 |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  | 119,865 |  |  |  |  |
Balance at Jun. 30, 2022 | $ 44,241 |  | $ 1,199 | $ 2,449,281 |  | $ (2,405,310) |  | $ (929)

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