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Note 13 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (in thousands) |
Cost of revenue |  | $ | 3,477 |  |  | $ | 592 |  |  | $ | 415 |
Sales and marketing |  |  | 15,906 |  |  |  | 19,973 |  |  |  | 8,166 |
General and administrative |  |  | 24,063 |  |  |  | 12,916 |  |  |  | 5,034 |
Research and development |  |  | 16,062 |  |  |  | 286 |  |  |  | 278 |
Total stock-based compensation |  | $ | 59,508 |  |  | $ | 33,767 |  |  | $ | 13,893 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  |  | July 1, |  |  | September 1, |
|  |  | 2021 |  |  | 2021 |
Expected term (in years) |  |  | 2.77 |  |  |  | 6.11 |
Expected volatility |  |  | 43.25 | % |  |  | 43.31 | %
Risk-free rate |  |  | 0.37 | % |  |  | 0.94 | %
Dividend yield |  |  | — |  |  |  | — |
|  | July 1 |
|  | 2021 |
Expected term (in years) |  |  | 4.10 |
Expected volatility |  |  | 34.44 | %
Risk-free rate |  |  | 0.79 | %
Dividend yield |  |  | — |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value |
|  | (Aggregate Intrinsic Value figure presented in thousands) |
Balance, January 1, 2019 |  |  | 23,326,692 |  |  |  | 0.96 |  |  |  | 6.12 |  |  |  | — |
Options granted |  |  | 5,333,452 |  |  |  | 1.52 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (451,953 | ) |  |  | 0.19 |  |  |  | — |  |  |  | — |
Options forfeited or expired |  |  | (2,501,900 | ) |  |  | 0.70 |  |  |  | — |  |  |  | — |
Balance, December 31, 2019 |  |  | 24,926,640 |  |  |  | 1.13 |  |  |  | 6.42 |  |  |  | — |
Options granted |  |  | 11,537,242 |  |  |  | 3.91 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (707,888 | ) |  |  | 0.77 |  |  |  | — |  |  |  | — |
Options forfeited or expired |  |  | (898,926 | ) |  |  | 1.32 |  |  |  | — |  |  |  | — |
Balance, December 31, 2020 |  |  | 34,857,068 |  |  |  | 2.05 |  |  |  | 6.89 |  |  |  | — |
Options granted |  |  | 5,611,658 |  |  |  | 9.64 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (5,141,331 | ) |  |  | 1.08 |  |  |  | — |  |  |  | — |
Options forfeited or expired |  |  | (4,847,078 | ) |  |  | 0.44 |  |  |  | — |  |  |  | — |
Balance, December 31, 2021 |  |  | 30,480,317 |  |  | $ | 3.87 |  |  |  | 2.83 |  |  | $ | 92,600 |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  | Outstanding |  |  | Exercisable |
Exercise Price |  | Stock Options |  |  | Weighted-Average Contractual Life |  |  | Weighted-Average Exercise Price |  |  | Stock Options |  |  | Weighted-Average Contractual Life |  |  | Weighted-Average Exercise Price |
$ 0.03 - $ 1.34 |  |  | 6,634,833 |  |  |  | 4.69 |  |  | $ | 1.28 |  |  |  | 6,634,833 |  |  |  | 4.69 |  |  | $ | 1.28 |
$ 1.52 - $ 1.89 |  |  | 6,879,874 |  |  |  | 5.84 |  |  |  | 1.59 |  |  |  | 5,195,211 |  |  |  | 5.46 |  |  |  | 1.59 |
$ 3.90 - $ 9.64 |  |  | 16,965,610 |  |  |  | 8.96 |  |  |  | 5.80 |  |  |  | 3,545,801 |  |  |  | 8.61 |  |  |  | 3.90 |
|  |  | 30,480,317 |  |  |  | 7.33 |  |  | $ | 3.87 |  |  |  | 15,375,845 |  |  |  | 5.85 |  |  | $ | 1.99 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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