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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Income (Loss) Before Income Tax Provision | Loss from operations before income taxes consists of the following (in thousands):
| Year ended December 31,
| 2016 |  | 2015 |  | 2014
United States | $ | (53,833 | ) |  | $ | (16,826 | ) |  | $ | (15,515 | )
International | (26,597 | ) |  | 758 |  |  | (6,280 | )
Loss before income taxes | $ | (80,430 | ) |  | $ | (16,068 | ) |  | $ | (21,795 | )
Provision for Income Taxes | The components of the provision for (benefit from) income taxes consist of the following (in thousands):
| Year ended December 31,
| 2016 |  | 2015 |  | 2014
Current: |  |  |  |  |
Federal | $ | (950 | ) |  | $ | (1,981 | ) |  | $ | (11,525 | )
State | 181 |  |  | 120 |  |  | 8 |
International | 2,738 |  |  | 1,966 |  |  | 1,619 |
Deferred: |  |  |  |  |
Federal | (713 | ) |  | — |  |  | 25,722 |
State | — |  |  | — |  |  | 8,249 |
International | (9,372 | ) |  | (512 | ) |  | 380 |
Total provision for (benefit from) income taxes | $ | (8,116 | ) |  | $ | (407 | ) |  | $ | 24,453 |
Reconciliation of Provision for Income Taxes | The differences between the provision for (benefit from) income taxes computed at the U.S. federal statutory rate at 35% and the Company’s actual provision for (benefit from) income taxes are as follows (in thousands):
| Year ended December 31,
| 2016 |  | 2015 |  | 2014
Benefit from for income taxes at U.S. Federal statutory rate | $ | (28,150 | ) |  | $ | (5,624 | ) |  | $ | (7,628 | )
State taxes | 150 |  |  | 120 |  |  | 5,368 |
Differential in rates on foreign earnings | 11,741 |  |  | 1,584 |  |  | 4,311 |
Non-deductible amortization expense | 617 |  |  | 947 |  |  | 3,138 |
Change in valuation allowance | 4,465 |  |  | 2,230 |  |  | 26,053 |
Change in liabilities for uncertain tax positions | (960 | ) |  | (1,083 | ) |  | (8,126 | )
Non-deductible stock-based compensation | 1,480 |  |  | 1,398 |  |  | 1,665 |
Research and development tax credits | (129 | ) |  | (178 | ) |  | (841 | )
Non-deductible meals and entertainment | 441 |  |  | 395 |  |  | 361 |
Non-deductible acquisition cost | — |  |  | 457 |  |  | — |
Adjustments related to tax positions taken during prior years | (163 | ) |  | (781 | ) |  | — |
Adjustments made under intercompany transactions | 1,779 |  |  | — |  |  | — |
Withholding tax | 457 |  |  | — |  |  | — |
Other | 156 |  |  | 128 |  |  | 152 |
Total provision for (benefit from) income taxes | $ | (8,116 | ) |  | $ | (407 | ) |  | $ | 24,453 |
Components of Deferred Tax Assets and Liabilities | The components of net deferred tax assets included in the Consolidated Balance Sheets are as follows (in thousands):
| December 31,
| 2016 |  | 2015
Deferred tax assets: |  |  |
Reserves and accruals | $ | 25,527 |  |  | $ | 16,413 |
Net operating loss carryovers | 33,321 |  |  | 27,023 |
Research and development credit carryovers | 28,759 |  |  | 27,595 |
Deferred stock-based compensation | 4,292 |  |  | 5,834 |
Depreciation and amortization | 554 |  |  | — |
Other tax credits | 2,738 |  |  | 2,738 |
Gross deferred tax assets | 95,191 |  |  | 79,603 |
Valuation allowance | (74,480 | ) |  | (64,545 | )
Gross deferred tax assets after valuation allowance | 20,711 |  |  | 15,058 |
Deferred tax liabilities: |  |  |
Depreciation and amortization | — |  |  | (1,189 | )
Intangibles | (1,417 | ) |  | (899 | )
Convertible notes | (8,603 | ) |  | (10,233 | )
Other | (510 | ) |  | (510 | )
Gross deferred tax liabilities | (10,530 | ) |  | (12,831 | )
Net deferred tax assets | $ | 10,181 |  |  | $ | 2,227 |
Activities Related to Valuation Allowance | The following table summarizes the activities related to the Company’s valuation allowance (in thousands):
| Year ended December 31,
| 2016 |  | 2015 |  | 2014
Balance at beginning of period | $ | 64,545 |  |  | $ | 75,199 |  |  | $ | 38,644 |
Additions | 18,291 |  |  | 3,068 |  |  | 39,556 |
Deductions | (8,356 | ) |  | (13,722 | ) |  | (3,001 | )
Balance at end of period | $ | 74,480 |  |  | $ | 64,545 |  |  | $ | 75,199 |
Activities Related to Gross Unrecognized Tax Benefits | The following table summarizes the activity related to the Company’s gross unrecognized tax benefits (in millions):
| Year ended December 31,
| 2016 |  | 2015 |  | 2014
Balance at beginning of period | $ | 15.6 |  |  | $ | 15.7 |  |  | $ | 24.2 |
Increase in balance related to tax positions taken during current year | 4.6 |  |  | 0.7 |  |  | 1.0 |
Decrease in balance as a result of a lapse of the applicable statues of limitations | (1.0 | ) |  | (0.9 | ) |  | (9.5 | )
Increase in balance related to tax positions taken during prior years | — |  |  | 0.3 |  |  | — |
Decrease in balance related to tax positions taken during prior years | — |  |  | (0.2 | ) |  | — |
Balance at end of period | $ | 19.2 |  |  | $ | 15.6 |  |  | $ | 15.7 |

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