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Note 11 - Common Stock and Stock-based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of options and SAR units (1) |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic- value |
Outstanding as of December 31, 2018 |  |  | 702,817 |  |  | $ | 19.88 |  |  |  | 4.3 |  |  | $ | 2,708 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (54,114 | ) |  |  | 16.73 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (730 | ) |  |  | 21.83 |  |  |  |  |  |  |  |  |
Outstanding as of September 30, 2019 (2) |  |  | 647,973 |  |  | $ | 20.14 |  |  |  | 3.7 |  |  | $ | 6,361 |
Exercisable as of September 30, 2019 (3) |  |  | 611,677 |  |  | $ | 19.62 |  |  |  | 3.6 |  |  | $ | 6,313 |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | Number of RSUs and PSUs |  |  | Weighted Average Grant-Date Fair Value |
Unvested as of December 31, 2018 |  |  | 564,390 |  |  | $ | 32.28 |
Granted |  |  | 489,099 |  |  |  | 27.77 |
Vested |  |  | (266,820 | ) |  |  | 29.78 |
Forfeited or expired |  |  | (49,117 | ) |  |  | 31.19 |
Unvested as of September 30, 2019 |  |  | 737,552 |  |  | $ | 30.27 |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2019 (unaudited) |  |  | 2018 (unaudited) |  |  | 2019 (unaudited) |  |  | 2018 (unaudited) |
Cost of revenue |  | $ | 464 |  |  | $ | 480 |  |  | $ | 168 |  |  | $ | 155 |
Research and development, net |  |  | 4,314 |  |  |  | 3,874 |  |  |  | 1,494 |  |  |  | 1,246 |
Sales and marketing |  |  | 1,112 |  |  |  | 1,246 |  |  |  | 362 |  |  |  | 369 |
General and administrative |  |  | 1,957 |  |  |  | 2,483 |  |  |  | 728 |  |  |  | 697 |
Total equity-based compensation expense |  | $ | 7,847 |  |  | $ | 8,083 |  |  | $ | 2,752 |  |  | $ | 2,467 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Nine months ended September 30, |  | Three months ended September 30, |
|  | 2019 (unaudited) |  | 2018 (unaudited) |  | 2019 (unaudited) |  |  | 2018 (unaudited) |
Expected dividend yield |  |  | 0% |  |  |  | 0% |  |  |  | 0 | % |  |  | 0 | %
Expected volatility |  | 42% | - | 43% |  | 35% | - | 42% |  |  | 42 | % |  |  | 38 | %
Risk-free interest rate |  | 2.0% | - | 2.5% |  | 0.7% | - | 2.2% |  |  | 2.0 | % |  |  | 2.2 | %
Contractual term of up to (months) |  |  | 24 |  |  |  | 24 |  |  |  | 24 |  |  |  | 24 |

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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=116856206&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=115993241&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=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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