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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common stock | Additional Paid-in capital | Accumulated deficit | Accumulated other comprehensive loss
--- | --- | --- | --- | --- | ---
Beginning balances (in shares) at Dec. 31, 2016 |  |  | 121,645 |  |  |
Beginning balances at Dec. 31, 2016 |  | $ 270,430 | $ 1,216 | $ 680,315 | $ (406,945) | $ (4,156)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | (70,562) |  |  | (70,562) |
Unrealized gain (loss) related to marketable securities, net of tax |  | (73) |  |  |  | (73)
Recognized gain (loss) on redemption of marketable securities, previously unrealized |  | 252 |  |  |  | 252
Translation adjustments, net of tax |  | 2,620 |  |  |  | 2,620
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of shares withheld for employee taxes (in shares) |  |  | 2,250 |  |  |
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of shares withheld for employee taxes |  | 2,818 | $ 23 | 2,795 |  |
Stock-based compensation expense related to stock options, ESPP and RSUs | [1] | 12,658 |  | 12,658 |  |
Defined benefit pension, net of actuarial valuation adjustments |  | (95) |  |  |  | (95)
Ending balances (in shares) at Dec. 30, 2017 |  |  | 123,895 |  |  |
Ending balances at Dec. 30, 2017 |  | 217,693 | $ 1,239 | 695,768 | (477,862) | (1,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | (26,322) |  |  | (26,322) |
Unrealized gain (loss) related to marketable securities, net of tax |  | 41 |  |  |  | 41
Recognized gain (loss) on redemption of marketable securities, previously unrealized |  | (18) |  |  |  | (18)
Translation adjustments, net of tax |  | (1,271) |  |  |  | (1,271)
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of shares withheld for employee taxes (in shares) |  |  | 5,833 |  |  |
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of shares withheld for employee taxes |  | 26,918 | $ 58 | 26,860 |  |
Stock-based compensation expense related to stock options, ESPP and RSUs |  | 13,646 |  | 13,646 |  |
Defined benefit pension, net of actuarial valuation adjustments |  | $ 369 |  |  |  | 369
Ending balances (in shares) at Dec. 29, 2018 |  | 129,728 | 129,728 |  |  |
Ending balances at Dec. 29, 2018 |  | $ 258,457 | $ 1,297 | 736,274 | (476,783) | (2,331)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | 43,493 |  |  | 43,493 |
Unrealized gain (loss) related to marketable securities, net of tax |  | 42 |  |  |  | 42
Recognized gain (loss) on redemption of marketable securities, previously unrealized |  | (53) |  |  |  | (53)
Translation adjustments, net of tax |  | 341 |  |  |  | 341
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of shares withheld for employee taxes (in shares) |  |  | 4,155 |  |  |
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of shares withheld for employee taxes |  | 7,082 | $ 42 | 7,040 |  |
Stock-based compensation expense related to stock options, ESPP and RSUs |  | 18,899 |  | 18,899 |  |
Defined benefit pension, net of actuarial valuation adjustments |  | $ (602) |  |  |  | (602)
Ending balances (in shares) at Dec. 28, 2019 |  | 133,883 | 133,883 |  |  |
Ending balances at Dec. 28, 2019 |  | $ 327,659 | $ 1,339 | $ 762,213 | $ (433,290) | $ (2,603)
[1] | In the third quarter of fiscal 2017, in relation to the sale of 100% of the equity of our Hyderabad, India subsidiary and certain assets related to our SimplayLabs testing and certification business, certain stock compensation was accelerated due to a change of control agreement. As a result of this acceleration,the equity effect of stock compensation shown above includes approximately $0.1 million that was charged to restructuring expense as part of the June2017 Plan (see "Note 7 - Restructuring").

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