Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | 12. Equity incentive plans We have adopted equity incentive plans that provide for the grant of stock awards to employees, directors and consultants that are designed to encourage and reward their long-term contributions to us and provide an incentive for them to remain with us. These plans are also intended to align our employees’ interest with the creation of long-term shareholder value. On July 10, 2015, 2015 “2015 2015 August 20, 2015. 2015 2001 “2001 2009 “2009 2001 Our 2015 may The total number of shares of the Company’s common stock reserved for issuance under the 2015 3,000,000 5,000,000 As of January 28, 2017, 1,914,637 2015 2,380,734 may 2015 September 23, 2009 August 20, 2015, 2001 2009 The majority of restricted stock units and restricted stock awards that vested during fiscal 2017, 2016 2015 85,465, 42,654 34,356 2017, 2016 2015, $1.5 $1 .5 $0.3 2017, 2016 2015, Stock Options The total stock option activities and balances of our stock option plans are summarized as follows: Number of Options Outstanding Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value As of February 1, 2014 4,094,621 $ 11.24 4.8 Granted (Weighted average fair value of $1.80) 467,400 4.54 Cancelled (734,702 ) 9.52 Exercised (59,261 ) 4.59 As of January 31, 2015 3,768,058 10.86 4.9 Granted (Weighted average fair value of $3.64) 104,200 8.74 Cancelled (415,146 ) 10.39 Exercised (523,441 ) 6.83 As of January 30, 2016 2,933,671 11.57 4.2 Granted (Weighted average fair value of $3.14) 483,400 6.87 Cancelled (556,616 ) 11.41 Exercised (194,884 ) 4.75 As of January 28, 2017 2,665,571 $ 11.25 4.5 $ 566,742 Ending vested and expected to vest 2,621,451 $ 11.33 4.4 $ 565,667 Ending exercisable 2,131,470 $ 12.35 3.3 $ 513,643 The aggregate intrinsic value, as of January 28, 2017, $6.40 2017, 2016 2015 $0.6 $1.6 $0.1 2017, 2016 2015 $0.5 $1 .3 $2.1 The options outstanding and currently exercisable as of January 28, 2017 Options Outstanding and Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Term (Years) Weighted Average Exercise Price Per Share Number Exercisable Weighted Average Exercise Price Per Share $0.92 - $4.98 297,053 6.95 $ 4.60 260,579 $ 4.55 $5.76 - $6.48 335,539 8.34 6.36 95,155 6.08 $6.49 - $7.30 294,240 7.56 6.80 171,982 6.60 $7.44 - $10.51 209,083 7.29 8.39 74,098 9.28 $10.59 - $10.59 318,700 2.97 10.59 318,700 10.59 $10.87 - $10.87 300,600 1.74 10.87 300,600 10.87 $11.07 - $11.09 353,934 2.39 11.08 353,934 11.08 $11.47 - $15.25 348,422 2.15 13.23 348,422 13.23 $15.64 - $41.58 164,000 1.29 33.83 164,000 33.83 $45.83 - $45.83 44,000 0.77 45.83 44,000 45.83 2,665,571 4.48 $ 11.25 2,131,470 $ 12.35 As of January 28, 2017, $1.5 3.0 The amortization period is based on the expected remaining vesting term of the options. Restricted Stock Awards Restricted stock awards, or RSAs, may 2015 one one 2009 ten one five January 28, 2017 January 30, 2016, no January 31, 2015, 44,189 $8.75. Restricted Stock Units We value restricted stock units, or RSUs, using the quoted market price of the underlying stock on the date of grant. RSUs are granted under our 2015 ten four one one 2015 one 2015 one All awards generally provide for accelerated vesting upon a change in control or normal or early retirement (as defined in the applicable stock incentive plan). During the fourth 2016, 299,971 two Stock-based compensation expense will be recognized over the requisite service period based on management’s best estimate of the probability of the performance criteria being satisfied using the most currently available projections of future sales performance, adjusted at each balance sheet date. Changes in the subjective and probability-based assumptions can materially affect the estimate of fair value of stock-based compensation and consequently, the related amount recognized in our consolidated statements of operations. As of January 28, 2017, 2017 2016 . The following table sets forth the shares of RSUs outstanding as of January 28, 2017: Restricted Stock Units Weighted Average Grant Date Fair Value per Unit Aggregate Intrinsic Value As of February 1, 2014 468,507 $ 5.78 2,197,298 Granted 1,157,127 4.91 Vested (257,315 ) 6.22 Cancelled/forfeited (54,404 ) 6.09 As of January 31, 2015 1,313,915 4.91 8,356,499 Granted 1,165,832 8.74 Vested (861,259 ) 5.52 Cancelled/forfeited (215,876 ) 7.37 As of January 30, 2016 1,402,612 7.53 9,299,318 Granted 1,057,944 7.42 Vested (783,909 ) 7.13 Cancelled/forfeited (38,029 ) 7.67 As of January 28, 2017 1,638,618 $ 7.64 $ 10,487,155 The total fair value of RSUs which vested during fiscal 2017, 2016 2015 $5.6 $4 .8 $1.6 The aggregate intrinsic value, as of January 28, 2017, $6.40 January 28, 2017, $9.8 3.0 Employee stock purchase plan On July 10, 2015, 2015 “2015 2015 August 20, 2015. 2015 2010 “2010 3,500,000 2015 2015 2015 may 15% $25,000 85% six 2015 During fiscal 2017, 2016 2015, 486,131, 92,122 626,966 $5.23, $5.37 $3.89 January 28, 2017, 2,921,747 3,500,000 2015 2015 2016 2010 2015 315,810 2,500,000 2010 During the first 2016, 2015 2010 may 2010 may 2018 2015. As of January 28, 2017, 42,684 2010 may $3.89 $0.4 may tender may 2015. may On August 22, 2016, 2010 $0.3 January 28, 2017 Valuation of stock-based compensation The fair value of RSA and RSU awards is based on the quoted market price of the underlying stock at the date of grant. The fair value of stock option and employee stock purchase plan right awards is estimated at the grant date using the Black-Scholes-Merton option pricing model. The determination of fair value of stock option and employee stock purchase plan right awards on the date of grant using an option-pricing model is affected by our stock price as well as assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, our expected stock price volatility over the term of the awards and actual employee stock option exercise behavior. The fair value of each stock option and employee stock purchase plan right was estimated on the date of grant using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions: Fiscal Years Ended Stock options January 28, 2017 January 30, 2016 January 31, 2015 Expected volatility 50.77 % 44.84 % 42.72 % Risk-free interest rate 1.27 % 1.60 % 1.63 % Expected term (in years) 5.23 5.19 5.11 Dividend yield 0 % 0 % 0 % Weighted average fair value at grant date $ 3.14 $ 3.64 $ 1.80 Fiscal Years Ended Employee stock purchase plan January 28, 2017 January 30, 2016 January 31, 2015 Expected volatility 57.19 % 77.90 % 50.05 % Risk-free interest rate 0.50 % 0.44 % 0.08 % Expected term (in years) 0.50 0.46 0.50 Dividend yield 0 % 0 % 0 % Weighted average fair value at grant date $ 1.91 $ 2.24 $ 1.67 The computation of the expected volatility assumptions used in the Black-Scholes-Merton calculations for new stock option and employee stock purchase plan right awards is based on the historical volatility of our stock price, measured over a period equal to the expected term of the grants or purchase rights. The risk-free interest rate is based on the yield available on U.S. Treasury Strips with an equivalent remaining term. The expected term of stock options represents the weighted-average period that the stock options are expected to remain outstanding and was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based payment awards and vesting schedules. The expected term of employee stock purchase rights is the period of time remaining in the current offering period. The dividend yield assumption is based on our history of not paying dividends and assumption that we will not pay dividends in the future. Stock-based compensation expense related to purchases of common stock under the 2015 2010 2017, 2016 2015 $1.0 $0.2 $0.8 The following table sets forth the total stock-based compensation expense that is included in each functional line item in the consolidated statements of operations (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Cost of revenue $ 294 $ 227 $ 190 Research and development 3,452 3,241 3,147 Sales and marketing 1,197 1,151 979 General and administrative 1,562 1,940 1,963 Total stock-based compensation $ 6,505 $ 6,559 $ 6,279 Shares reserved for future issuance We had the following shares of common stock reserved for future issuance upon exercise or issuance of equity instruments at January 28, 2017: Shares Reserved Authorized for future grants under stock incentive plans 4,836,384 Stock options outstanding 2,665,571 Restricted stock units outstanding 1,638,618 Shares reserved for future issuance 9,140,573 401(k) We maintain a 401(k) 401(k) may $18 ,000 2016 . Employees age 50 may $6,000. 401(k) 2017 2016 $0.6 $0.3 no 2015. Endowment insurance pension plan Related to our acquisition of our DTV business in May 2012, 8.0% 20% April 2016 March 2017, 17,817 During fiscal 2017, 2016 2015, $2.3 $2 .3 $2.1 Retirement pension plans We maintain retirement pension plans for the benefit of qualified employees in Denmark, Taiwan, The Netherlands, and Germany. We made matching contributions under these plans of $0.7 2017, 2016 2015. Severance plan We maintain a severance plan for several Israeli employees pursuant to Israel's Severance Pay Law based on the most recent salary of the employees multiplied by the number of years of employment. Upon termination of employment, employees are entitled to one January 28, 2017, $0.8 $0.7 $0.1 2017, 2016 2015. |