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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | For the years ended December 31, 2020, 2019 and 2018, income (loss) before income taxes is broken out between U.S. and foreign-sourced operations and consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Domestic | ​ | $ | (32,216) | ​ | $ | (37,277) | ​ | $ | 21,084
Foreign | ​ |  | 18,985 | ​ |  | 39,470 | ​ |  | 28,435
Total | ​ | $ | (13,231) | ​ | $ | 2,193 | ​ | $ | 49,519
Schedule of Components of Income Tax Expense (Benefit) | The components of the provision for income taxes for the years ended December 31, 2020, 2019 and 2018, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Current expense (benefit): |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | (937) | ​ | $ | 479 | ​ | $ | (1,132)
State | ​ |  | 437 | ​ |  | 662 | ​ |  | 582
Foreign | ​ |  | 8,407 | ​ |  | 8,037 | ​ |  | 6,000
Total current expense (benefit) | ​ |  | 7,907 | ​ |  | 9,178 | ​ |  | 5,450
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred expense (benefit): | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ |  | (2,688) | ​ |  | (8,111) | ​ |  | 4,400
State | ​ |  | (4,524) | ​ |  | (3,523) | ​ |  | (667)
Foreign | ​ |  | (4,083) | ​ |  | (802) | ​ |  | (1,681)
Total deferred expense (benefit) | ​ |  | (11,295) | ​ |  | (12,436) | ​ |  | 2,052
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total income tax expense (benefit) | ​ | $ | (3,388) | ​ | $ | (3,258) | ​ | $ | 7,502
Schedule of Effective Income Tax Rate Reconciliation | The difference between the income tax expense (benefit) reported and amounts computed by applying the statutory federal rate of 21.0% to pretax income (loss) for the years ended December 31, 2020, 2019 and 2018, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Computed federal income tax expense (benefit) at applicable statutory rate of 21% | ​ | $ | (2,778) | ​ | $ | 461 | ​ | $ | 10,399
State income tax expense (benefit) | ​ |  | (1,448) | ​ |  | (2,241) | ​ |  | (59)
Tax credits | ​ |  | (2,098) | ​ |  | (1,567) | ​ |  | (1,734)
Foreign tax rate differential | ​ |  | (1,230) | ​ |  | (1,536) | ​ |  | (1,361)
Uncertain tax positions | ​ |  | (576) | ​ |  | (794) | ​ |  | 267
Deferred compensation insurance assets | ​ |  | (299) | ​ |  | (503) | ​ |  | 186
Transaction-related expenses | ​ |  | — | ​ |  | 154 | ​ |  | 223
U.S. transition tax | ​ |  | — | ​ |  | — | ​ |  | (3,271)
TCJA remeasurement of deferred taxes | ​ |  | — | ​ |  | — | ​ |  | (71)
Stock-based payments | ​ |  | (1,815) | ​ |  | (1,654) | ​ |  | (4,278)
Net GILTI | ​ |  | 3,960 | ​ |  | 1,861 | ​ |  | 347
Foreign withholding tax | ​ |  | 228 | ​ |  | 638 | ​ |  | 5,590
Foreign permanent differences (1) | ​ | ​ | 1,728 | ​ | ​ | 937 | ​ | ​ | 96
Valuation allowance (1) | ​ | ​ | 1,879 | ​ | ​ | 131 | ​ | ​ | 21
DOJ settlement | ​ | ​ | 1,890 | ​ | ​ | — | ​ | ​ | —
Remeasurement of state deferred taxes | ​ | ​ | (1,765) | ​ | ​ | — | ​ | ​ | —
Other — including the effect of graduated rates (1) | ​ |  | (1,064) | ​ |  | 855 | ​ |  | 1,147
Total income tax expense (benefit) | ​ | $ | (3,388) | ​ | $ | (3,258) | ​ | $ | 7,502
(1) | Amounts for the years ended December 31, 2019 and 2018 in the table above have been updated for presentation and comparative purposes.
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax assets and liabilities at December 31, 2020 and 2019, consisted of the following temporary differences and carry-forward items (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Deferred income tax assets: |  | ​ |  |  | ​ |
Allowance for credit losses on trade receivables | ​ | $ | 1,198 | ​ | $ | 693
Accrued compensation expense | ​ |  | 9,694 | ​ |  | 9,244
Inventory differences | ​ |  | 3,161 | ​ |  | 2,207
Net operating loss carryforwards | ​ |  | 18,622 | ​ |  | 21,187
Deferred revenue | ​ |  | 617 | ​ |  | 552
Stock-based compensation expense | ​ |  | 7,360 | ​ |  | 4,672
Operating lease assets | ​ | ​ | 15,182 | ​ | ​ | 16,838
Federal R&D tax credit | ​ | ​ | 3,607 | ​ | ​ | 1,376
Other | ​ |  | 13,993 | ​ |  | 6,189
Total deferred income tax assets | ​ |  | 73,434 | ​ |  | 62,958
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred income tax liabilities: | ​ |  |  | ​ |  |
Prepaid expenses | ​ |  | (1,078) | ​ |  | (1,128)
Property and equipment | ​ |  | (20,671) | ​ |  | (21,242)
Intangible assets | ​ |  | (47,178) | ​ |  | (53,933)
Foreign withholding tax | ​ |  | (5,358) | ​ |  | (5,240)
Operating lease liabilities | ​ | ​ | (13,855) | ​ | ​ | (15,847)
Other | ​ |  | (3,796) | ​ |  | (2,372)
Total deferred income tax liabilities | ​ |  | (91,936) | ​ |  | (99,762)
Valuation allowance | ​ |  | (10,213) | ​ |  | (4,644)
Net deferred income tax liabilities | ​ | $ | (28,715) | ​ | $ | (41,448)
​ | ​ | ​ | ​ | ​ | ​ | ​
Reported as: | ​ |  |  | ​ |  |
Deferred income tax assets | ​ | $ | 4,597 | ​ | $ | 3,788
Deferred income tax liabilities | ​ |  | (33,312) | ​ |  | (45,236)
Net deferred income tax liabilities | ​ | $ | (28,715) | ​ | $ | (41,448)
Summary of Income Tax Contingencies | A reconciliation of the beginning and ending amount of liabilities associated with uncertain tax benefits for the years ended December 31, 2020, 2019 and 2018, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Unrecognized tax benefits, opening balance | ​ | $ | 2,161 | ​ | $ | 2,947 | ​ | $ | 2,749
Gross increases (decreases) in tax positions taken in a prior year | ​ |  | 115 | ​ |  | (244) | ​ |  | 35
Gross increases in tax positions taken in the current year | ​ |  | 283 | ​ |  | 229 | ​ |  | 586
Lapse of applicable statute of limitations | ​ |  | (885) | ​ |  | (771) | ​ |  | (423)
Unrecognized tax benefits, ending balance | ​ | $ | 1,674 | ​ | $ | 2,161 | ​ | $ | 2,947

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