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Income Taxes - Reconciliation of Tax Expense Computed at Statutory Federal Rate and Company's Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Tax at statutory federal rate | $ (9,172) | $ (11,446) | $ (10,570)
Stock-based compensation | (20,762) | (5,560) | (8,557)
Meals and Entertainment | 177 | 409 | 309
Other | 805 | 614 | 148
Tax credits | (1,426) | (1,128) | (1,015)
2017 Tax Act | 0 | 0 | 44
Change in valuation allowance | 30,607 | 17,176 | 19,685
Total Tax Expense (benefit) | $ 229 | $ 65 | $ 44

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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