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Income Taxes - Provision, Reconciliation and Deferred Taxes (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
United States and foreign loss before income taxes: |  |  |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  |  |  |  | $ (51,370,000) | $ (134,096,000) | $ (50,339,000)
Foreign |  |  |  |  |  |  |  |  | 2,103,000 | 1,782,000 | 303,000
Loss before taxes |  |  |  |  |  |  |  |  | (49,267,000) | (132,314,000) | (50,036,000)
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  |  | (949,000) | 237,000
State |  |  |  |  |  |  |  |  | 189,000 | 275,000 | 122,000
Foreign |  |  |  |  |  |  |  |  | 1,162,000 | 715,000 | 487,000
Total current income tax provision |  |  |  |  |  |  |  |  | 1,351,000 | 41,000 | 846,000
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 264,000 | (10,098,000) | (58,368,000)
State |  |  |  |  |  |  |  |  | (1,234,000) | (1,952,000) | (7,938,000)
Foreign |  |  |  |  |  |  |  |  | (55,000) | 43,000 |
Total deferred income tax provision |  |  |  |  |  |  |  |  | (1,025,000) | (12,007,000) | (66,306,000)
Income tax provision (benefit) | $ (363,000) | $ 202,000 | $ 208,000 | $ 279,000 | $ (3,243,000) | $ (889,000) | $ (7,384,000) | $ (450,000) | 326,000 | (11,966,000) | (65,460,000)
Reconciliations of the U.S. federal statutory tax rate to the combined effective tax rate |  |  |  |  |  |  |  |  |  |  |
Statutory rate of tax benefit |  |  |  |  |  |  |  |  | (10,346,000) | (27,713,000) | (10,508,000)
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | (3,395,000) | (4,674,000) | (2,418,000)
Permanent and other items |  |  |  |  |  |  |  |  | 4,513,000 | 263,000 | 4,371,000
Stock-based compensation |  |  |  |  |  |  |  |  | (12,310,000) | (3,537,000) | (5,006,000)
Research credits |  |  |  |  |  |  |  |  | (5,408,000) | (5,082,000) | (3,594,000)
Uncertain tax positions |  |  |  |  |  |  |  |  | 2,685,000 | 3,835,000 | 1,780,000
Change in tax rate |  |  |  |  |  |  |  |  | (802,000) | 1,303,000 | 419,000
NOL Carryback Claim |  |  |  |  |  |  |  |  |  | (447,000) |
ASU 2016-09 Implementation & ASC 842 Adoption in 2019 |  |  |  |  |  |  |  |  |  |  | (104,000)
Valuation allowance |  |  |  |  |  |  |  |  | 25,389,000 | 24,086,000 | (50,400,000)
Income tax provision (benefit) | (363,000) | $ 202,000 | $ 208,000 | $ 279,000 | (3,243,000) | $ (889,000) | $ (7,384,000) | $ (450,000) | 326,000 | (11,966,000) | $ (65,460,000)
Components of deferred tax assets |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 100,464,000 |  |  |  | 87,684,000 |  |  |  | 100,464,000 | 87,684,000 |
Tax credits | 16,968,000 |  |  |  | 14,293,000 |  |  |  | 16,968,000 | 14,293,000 |
Stock-based compensation | 15,521,000 |  |  |  | 19,972,000 |  |  |  | 15,521,000 | 19,972,000 |
Reserves and accruals | 10,241,000 |  |  |  | 9,013,000 |  |  |  | 10,241,000 | 9,013,000 |
Lease liability | 25,188,000 |  |  |  | 20,434,000 |  |  |  | 25,188,000 | 20,434,000 |
Other, net | 2,120,000 |  |  |  |  |  |  |  | 2,120,000 |  |
Total deferred tax assets | 170,502,000 |  |  |  | 151,396,000 |  |  |  | 170,502,000 | 151,396,000 |
Depreciation and amortization | (67,641,000) |  |  |  | (76,034,000) |  |  |  | (67,641,000) | (76,034,000) |
ROU Lease Asset | (18,747,000) |  |  |  | (17,471,000) |  |  |  | (18,747,000) | (17,471,000) |
Convertible Notes |  |  |  |  | (22,252,000) |  |  |  |  | (22,252,000) |
Other, net |  |  |  |  | (542,000) |  |  |  |  | (542,000) |
Inventory | (59,000) |  |  |  | (59,000) |  |  |  | (59,000) | (59,000) |
Total deferred tax liabilities | (86,447,000) |  |  |  | (116,358,000) |  |  |  | (86,447,000) | (116,358,000) |
Valuation allowance | (91,373,000) |  |  |  | (45,551,000) |  |  |  | (91,373,000) | (45,551,000) |
Net deferred tax liability | $ (7,318,000) |  |  |  | $ (10,513,000) |  |  |  | $ (7,318,000) | $ (10,513,000) |

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