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Note 13 - Stock-based Compensation | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 1 3 – Stock-Based Compensation The Company has two equity incentive plans: the 2000 Stock Option Plan ( 2000 Plan) and the 2012 Long-Term Incentive Plan ( 2012 Plan). Upon the adoption of the 2012 Plan on February 21, 2012, all shares that were reserved but not issued under the 2000 Plan were assumed by the 2012 Plan. No additional awards will be issued under the 2000 Plan. Under the 2012 Plan, the Company has the ability to grant stock options, stock appreciation rights (SARs), restricted stock, performance stock, stock units, other stock-based awards and cash incentive awards. Awards under the 2012 Plan have a maximum term of ten years from the date of grant. The compensation committee of the board of directors may provide that the vesting or payment of any award will be subject to the attainment of specified performance measures in addition to the satisfaction of any continued service requirements, and the compensation committee will determine whether such measures have been achieved. The per share exercise price of stock options and SARs granted under the 2012 Plan generally may not be less than the fair market value of a share of our common stock on the date of the grant. Restricted stock is valued at fair market value on the date of grant. The Company’s 2012 Employee Stock Purchase Plan (ESPP) allows eligible employees to purchase a variable number of shares of the Company’s common stock at a discount through payroll deductions of up to 15 percent of their eligible compensation, subject to plan limitations. The ESPP provides for six -month offering periods with a single purchase period, and at the end of each offering period, employees are able to purchase shares at 85 percent of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last trading day of the offering period. The Company determines the fair value stock-based compensation related to its ESPP in accordance with ASC 718 using the component measurement approach and the Black-Scholes standard option pricing model. Employees purchased 33,562 and 41,307 shares of common stock under the ESPP at an average exercise price of $85.61 and $48.91 during 2018 and 2017, respectively. As of December 31, 2018, 1,210,445 shares remained available for future issuance under the ESPP. The Company determines its stock-based compensation in accordance with ASC 718, which requires the measurement and recognition of compensation expense for all share-based payment awards made to employees and non-employee directors based on fair value. Determining the appropriate fair value model and calculating the fair value of stock option grants requires the input of subjective assumptions. The Company uses the Black-Scholes option pricing model to value its stock option awards. Stock-based compensation expense is calculated using the Company’s best estimates, which involve inherent uncertainties and the application of management’s judgment. Significant estimates include its expected term and stock price volatility. The expected term of stock options is estimated from the vesting period of the award and represents the weighted average period that the Company's stock options are expected to be outstanding. The Company estimates the volatility of its stock price based on the historic volatility of its common stock. The Company bases the risk-free interest rate that it uses in the Black-Scholes option pricing model on U.S. Treasury instruments with maturities similar to the expected term of the award being valued. The Company has never paid and does not anticipate paying, any cash dividends in the foreseeable future and, therefore, the Company uses an expected dividend yield of zero in the option pricing model. The Company accounts for forfeitures as they occur. The Company allocates stock-based compensation expense on a straight-line basis over the requisite service period. The following table summarizes stock-based compensation expense for the years ended December 31, 2018, 2017 and 2016, respectively:
|  | Year Ended December 31, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Stock options and other |  | $ | 10,113 |  |  | $ | 7,954 |  |  | $ | 6,177 |
Employee stock purchase plan |  |  | 815 |  |  |  | 604 |  |  |  | 598 |
Total stock-based compensation expense |  | $ | 10,928 |  |  | $ | 8,558 |  |  | $ | 6,775 |
Cost of revenue |  | $ | 1,543 |  |  | $ | 970 |  |  | $ | 691 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Marketing and sales |  |  | 1,942 |  |  |  | 1,429 |  |  |  | 977 |
Research and development |  |  | 1,517 |  |  |  | 1,091 |  |  |  | 1,396 |
General and administrative |  |  | 5,926 |  |  |  | 5,068 |  |  |  | 3,711 |
Total stock-based compensation expense |  | $ | 10,928 |  |  | $ | 8,558 |  |  | $ | 6,775 |
Stock Options The following table provides the assumptions used in the Black-Scholes option pricing model for the years ended December 31, 2018, 2017 and 2016:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Risk-free interest rate |  | 2.52 - 3.07% |  |  | 2.24 - 2.36% |  |  | 1.53 - 2.68% |
Expected life (years) |  | 6.25 |  |  | 6.50 |  |  | 6.50 |
Expected volatility |  | 41.68 - 42.22% |  |  | 42.68 - 44.68% |  |  | 44.38 - 45.93% |
Expected dividend yield |  | 0% |  |  | 0% |  |  | 0% |
Weighted average grant date fair value |  | $50.08 |  |  | $32.26 |  |  | $26.61 |
The following table summarizes stock option activity and the weighted average exercise price for the years ended December 31, 2018, 2017 and 2016:
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  | Stock Options |  |  | Exercise Price |
Options outstanding at January 1, 2016 |  |  | 766,042 |  |  | $ | 36.52 |
Granted |  |  | 117,480 |  |  |  | 57.99 |
Exercised |  |  | (226,164 | ) |  |  | 16.65 |
Cancelled |  |  | (87,719 | ) |  |  | 61.41 |
Options outstanding at December 31, 2016 |  |  | 569,639 |  |  |  | 45.00 |
Granted |  |  | 60,100 |  |  |  | 69.06 |
Exercised |  |  | (187,313 | ) |  |  | 35.93 |
Cancelled |  |  | (43,371 | ) |  |  | 61.02 |
Options outstanding at December 31, 2017 |  |  | 399,055 |  |  |  | 51.13 |
Granted |  |  | 36,600 |  |  |  | 110.59 |
Exercised |  |  | (155,765 | ) |  |  | 38.92 |
Cancelled |  |  | (27,274 | ) |  |  | 74.35 |
Options outstanding at December 31, 2018 |  |  | 252,616 |  |  | $ | 64.71 |
Exercisable at December 31, 2018 |  |  | 125,925 |  |  | $ | 53.02 |
The outstanding options have a term of 10 years. For employees, options that have been granted become exercisable ratably over the vesting period, which is generally a four - or five -year period, beginning on the first anniversary of the grant date, subject to the employee’s continuing service to the Company. For directors, options generally become exercisable in full on the first anniversary of the grant date. The total intrinsic value of options exercised during the years ended December 31, 2018, 2017 and 2016, was $13.0 million, $7.0 million and $11.1 million, respectively. The aggregate intrinsic value represents the cumulative difference between the fair market value of the underlying common stock and the option exercise prices. For options outstanding at December 31, 2018, the weighted-average remaining contractual term was 5.7 years and the aggregate intrinsic value was $12.2 million. For options exercisable at December 31, 2018, the weighted-average remaining contractual term was 3.5 years and the aggregate intrinsic value was $7.5 million. Refer to the table below for additional information. The following table summarizes information about stock options outstanding at December 31, 2018:
|  |  | Options Outstanding, Vested and Expected to Vest |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price ($) |  |  | Number Exercisable |  |  | Weighted Average Exercise Price ($) |
$3.67 to $31.43 |  |  |  | 30,972 |  |  |  | 2.95 |  |  |  | 24.59 |  |  |  | 30,972 |  |  |  | 24.59 |
$31.44 to $66.87 |  |  |  | 133,492 |  |  |  | 5.36 |  |  |  | 58.52 |  |  |  | 69,210 |  |  |  | 58.78 |
$66.88 to $96.20 |  |  |  | 51,894 |  |  |  | 5.55 |  |  |  | 72.49 |  |  |  | 25,743 |  |  |  | 71.73 |
$96.21 to $123.10 |  |  |  | 36,258 |  |  |  | 9.23 |  |  |  | 110.59 |  |  |  | 0 |  |  |  | 0.00 |
The fair value of share-based payment transactions is recognized in the consolidated statements of comprehensive income. As of December 31, 2018, there was $3.3 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of 2.8 years. The total fair value of options vested was $1.5 million, $2.8 million and $3.6 million for the years ended December 31, 2018, 2017 and 2016, respectively. Restricted Stock The 2012 Plan provides for the award of restricted stock or restricted stock units. Restricted stock awards are share settled and restrictions lapse ratably over the vesting period, which is generally a four - or five -year period, beginning on the first anniversary of the grant date, subject to the employee’s continuing service to the Company. For directors, restrictions generally lapse in full on the first anniversary of the grant date. The following table summarizes restricted stock activity for the years ended December 31, 2018, 2017 and 2016:
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  |  |  |  |  | Grant Date |
|  | Restricted |  |  | Fair Value |
|  | Stock Awards |  |  | Per Share |
Restricted stock at January 1, 2016 |  |  | 124,393 |  |  | $ | 68.97 |
Granted |  |  | 161,555 |  |  |  | 59.37 |
Restrictions lapsed |  |  | (41,415 | ) |  |  | 67.78 |
Forfeited |  |  | (29,428 | ) |  |  | 63.23 |
Restricted stock at December 31, 2016 |  |  | 215,105 |  |  |  | 62.78 |
Granted |  |  | 210,744 |  |  |  | 63.70 |
Restrictions lapsed |  |  | (60,102 | ) |  |  | 63.60 |
Forfeited |  |  | (30,916 | ) |  |  | 61.99 |
Restricted stock at December 31, 2017 |  |  | 334,831 |  |  |  | 63.29 |
Granted |  |  | 106,855 |  |  |  | 115.41 |
Restrictions lapsed |  |  | (86,191 | ) |  |  | 63.64 |
Forfeited |  |  | (31,574 | ) |  |  | 68.67 |
Restricted stock at December 31, 2018 |  |  | 323,921 |  |  | $ | 79.85 |
As of December 31, 2018, there was $20.7 million of unrecognized compensation expense related to non-vested restricted stock, which is expected to be recognized over a weighted-average period of 3.1 years. Performance Stock Performance Stock Units (PSUs) are expressed in terms of a target number of PSUs, with anywhere between 0 percent and 150 percent of that target number capable of being earned and vesting at the end of a three -year performance period depending on the Company’s performance in the final year of the performance period and the award recipient’s continued employment. The following table summarizes performance stock activity for the years ended December 31, 2018, 2017 and 2016:
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  |  |  |  |  | Grant Date |
|  | Performance |  |  | Fair Value |
|  | Stock Awards |  |  | Per Share |
Performance stock at January 1, 2016 |  |  | - |  |  | $ | - |
Granted |  |  | - |  |  |  | - |
Restrictions lapsed |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Performance stock at December 31, 2016 |  |  | - |  |  |  | - |
Granted |  |  | 25,707 |  |  |  | 58.35 |
Restrictions lapsed |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Performance stock at December 31, 2017 |  |  | 25,707 |  |  |  | 58.35 |
Granted |  |  | 20,006 |  |  |  | 105.75 |
Restrictions lapsed |  |  | - |  |  |  | - |
Performance assumption change |  |  | 6,427 |  |  |  | 58.35 |
Forfeited |  |  | - |  |  |  | - |
Performance stock at December 31, 2018 |  |  | 52,140 |  |  | $ | 76.54 |
As of December 31, 2018, there was $2.2 million of unrecognized compensation expense related to non-vested performance stock, which is expected to be recognized over a weighted-average period of 1.8 years. Employee Stock Purchase Plan The following table presents the assumptions used to estimate the fair value of the ESPP during the years ended December 31, 2018, 2017 and 2016:
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Risk-free interest rate |  | 2.06 - 2.33% |  |  | 0.97 - 1.48% |  |  | 0.56 - 0.59% |
Expected life (months) |  | 6.00 |  |  | 6.00 |  |  | 6.00 |
Expected volatility |  | 31.50 - 37.36% |  |  | 24.49 - 34.51% |  |  | 39.51 - 49.13% |
Expected dividend yield |  | 0% |  |  | 0% |  |  | 0% |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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