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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Income (Loss) Before Taxes | The components of loss from continuing operations before income taxes consisted of the following (in thousands):
| Year ended December 31,
| 2019 |  | 2018 |  | 2017
Income (loss) before income taxes: |  |  |  |  |
United States | $ | (132,887 | ) |  | $ | (52,569 | ) |  | $ | (55,932 | )
Foreign | 9,994 |  |  | (20,841 | ) |  | 2,240 |
| $ | (122,893 | ) |  | $ | (73,410 | ) |  | $ | (53,692 | )
Schedule of Income Tax Expense (Benefit) | The provision (benefit) for income taxes from continuing operations consisted of the following (in thousands):
| Year ended December 31,
| 2019 |  | 2018 |  | 2017
Provision (benefit) for income taxes: |  |  |  |  |
Current: |  |  |  |  |
Federal | $ | 11 |  |  | $ | 561 |  |  | $ | (200 | )
State | 128 |  |  | 128 |  |  | 115 |
Foreign | 1,744 |  |  | 2,198 |  |  | 1,960 |
Total current | 1,883 |  |  | 2,887 |  |  | 1,875 |
Deferred: |  |  |  |  |
Federal | 9,790 |  |  | (8,481 | ) |  | 49,570 |
State | 1,630 |  |  | (1,414 | ) |  | (4,833 | )
Foreign | 383 |  |  | (1,477 | ) |  | (816 | )
Change in valuation allowance | (6,504 | ) |  | 11,885 |  |  | (64,236 | )
Total deferred | 5,299 |  |  | 513 |  |  | (20,315 | )
Total | $ | 7,182 |  |  | $ | 3,400 |  |  | $ | (18,440 | )
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation of the Company's effective tax rate for continuing operations to the statutory federal rate is as follows:
| Year ended December 31,
| 2019 |  | 2018 |  | 2017
U.S. statutory income tax rate | 21.0 | % |  | 21.0 | % |  | 35.0 | %
State income taxes, net of federal benefit | (0.2 | ) |  | (0.1 | ) |  | 1.2 |
Foreign income taxes | (1.0 | ) |  | (5.7 | ) |  | (0.5 | )
Acquisition costs | (0.5 | ) |  | (0.3 | ) |  | (6.0 | )
Foreign deemed dividends | (0.4 | ) |  | (3.4 | ) |  | (3.8 | )
Stock-based compensation | (0.7 | ) |  | (0.3 | ) |  | 26.8 |
Tax credits | 2.8 |  |  | 0.6 |  |  | (33.3 | )
Uncertain tax positions | (0.2 | ) |  | 1.3 |  |  | (1.2 | )
NOL and credit limitations | — |  |  | — |  |  | (18.9 | )
Valuation allowance | (0.7 | ) |  | (16.1 | ) |  | 29.0 |
Goodwill amortization | 0.4 |  |  | 0.3 |  |  | (1.7 | )
Meals and entertainment | (0.3 | ) |  | (0.4 | ) |  | (0.5 | )
Tax reform | (0.1 | ) |  | — |  |  | 8.8 |
Goodwill impairment | (25.4 | ) |  | — |  |  | — |
Other, net | (0.5 | ) |  | (1.5 | ) |  | (0.6 | )
Effective income tax rate | (5.8 | )% |  | (4.6 | )% |  | 34.3 | %
Summary of Deferred Tax Assets and Liabilities | The following is a summary of the significant components of deferred income tax assets and liabilities (in thousands):
| December 31,
| 2019 |  | 2018
Assets: |  |  |
Net operating loss carryforwards | $ | 61,057 |  |  | $ | 76,278 |
Research and development tax credits | 32,879 |  |  | 28,664 |
Deferred revenue | 7,868 |  |  | 5,755 |
Accrued expenses | 5,687 |  |  | 9,601 |
Inventory | 4,618 |  |  | 4,906 |
Stock-based compensation | 2,880 |  |  | 1,536 |
Fixed assets | 5,461 |  |  | 7,716 |
Other temporary differences | 2,138 |  |  | 1,943 |
| 122,588 |  |  | 136,399 |
Valuation allowance | (94,980 | ) |  | (101,484 | )
Total deferred tax assets | 27,608 |  |  | 34,915 |
Liabilities: |  |  |
Purchased intangible assets | (22,470 | ) |  | (26,014 | )
Unremitted foreign income | (4,827 | ) |  | (4,487 | )
Total deferred tax liabilities | (27,297 | ) |  | (30,501 | )
Total net deferred tax assets | $ | 311 |  |  | $ | 4,414 |
The deferred tax assets and liabilities based on tax jurisdictions are presented in the Company's consolidated balance sheets as follows: |  |  |
Deferred income taxes - noncurrent assets | $ | 4,959 |  |  | $ | 9,152 |
Deferred income taxes - noncurrent liabilities | (4,648 | ) |  | (4,738 | )
| $ | 311 |  |  | $ | 4,414 |
Schedule of Unrecognized Tax Benefits | A reconciliation of the Company's unrecognized tax benefits is as follows (in thousands):
| 2019 |  | 2018 |  | 2017
Unrecognized tax benefits at January 1 | $ | 3,461 |  |  | $ | 4,528 |  |  | $ | 8,969 |
Increases related to current year tax positions | 292 |  |  | 74 |  |  | 139 |
Increases related to prior period tax positions | — |  |  | 122 |  |  | 430 |
Increases related to business acquisitions | — |  |  | — |  |  | 2,012 |
Decreases related to prior period tax positions | (821 | ) |  | (1,263 | ) |  | (7,022 | )
Settlements | — |  |  | — |  |  | — |
Unrecognized tax benefits at December 31 | $ | 2,932 |  |  | $ | 3,461 |  |  | $ | 4,528 |

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