Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Taxes

The provision (benefit) for income taxes for the years ended December 31, 2020, 2019 and 2018 consists of the following:

	2020		2019		2018
Current tax expense (benefit):
Federal	$	(729)	$	96	$	(1,077)
State	86		444		777
Foreign	6,963		8,375		8,036
	6,320		8,915		7,736
Deferred income tax expense (benefit):
Federal	(12,253)		(3,970)		4,478
State	(1,173)		(938)		62
Foreign	(808)		(1,402)		(2,477)
	(14,234)		(6,310)		2,063
Provision (benefit) for income taxes	$	(7,914)	$	2,605	$	9,799

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation between income taxes computed at the statutory federal rate and the provision (benefit) for income taxes for the years ended December 31, 2020, 2019 and 2018 follows:

	2020		2019		2018
Tax provision at statutory rate based on income before income taxes	21.0	%	21.0	%	21.0	%
Stock-based compensation	(267.7)		(15.4)		(1.6)
Settlement of taxing authority examinations	(122.9)		(7.7)		(0.7)
Federal research credit	(124.2)		(4.0)		(2.8)
Tax treaty protocols	—		(2.9)		—
US tax on worldwide earnings at different rates	(123.7)		7.9		2.9
Foreign income taxes	129.6		6.4		3.6
Non deductible/non-taxable items	28.6		2.8		(1.4)
State income taxes, net of federal tax benefit	(24.5)		0.3		1.6
International tax reform	—		—		(3.6)
US tax reform	—		—		1.8
Other, net	(10.1)		(0.1)		(1.5)
	(493.9)	%	8.3	%	19.3	%

Schedule of Deferred Tax Assets and Liabilities

The tax effects of the significant temporary differences which comprise the deferred income tax assets and liabilities at December 31, 2020 and 2019 are as follows:

	2020		2019
Assets:
Inventory	$	4,649	$	4,085
Net operating losses	22,197		3,679
Capitalized research and development	5,187		6,201
Deferred compensation	2,240		2,102
Accounts receivable	2,784		2,556
Compensation and benefits	7,540		6,049
Accrued pension	5,348		3,710
Research and development credit	13,540		10,321
Interest limitation	—		5,702
Convertible notes hedge	6,999		9,004
Lease liabilities	4,452		5,688
Other	6,793		4,336
Less: valuation allowances	(2,721)		(1,732)
	79,008		61,701
Liabilities:
Goodwill and intangible assets	104,119		102,015
Depreciation	2,512		301
State taxes	9,614		11,161
Unremitted foreign earnings	2,423		2,619
Convertible notes debt discount	7,060		9,096
Lease right-of-use assets	4,313		5,338
	130,041		130,530
Net liability	$	(51,033)	$	(68,829)

Schedule of Income before Income Tax

Income before income taxes consists of the following U.S. and foreign income:

	2020		2019		2018
U.S. income	$	(16,026)	$	5,332	$	24,320
Foreign income	17,629		25,893		26,333
Total income	$	1,603	$	31,225	$	50,653

Schedule of Unrecognized Tax Benefits Rollforward

The following table summarizes the activity related to our unrecognized tax benefits for the years ending December 31,:

	2020		2019		2018
Balance as of January 1,	$	2,170	$	3,073	$	2,943
Increases (decreases) for positions taken in prior periods	—		—		(250)
Increases for positions taken in current periods	—		1,650		1,017
Decreases in unrecorded tax positions related to settlement with the taxing authorities	(1,970)		(2,404)		(370)
Decreases in unrecorded tax positions related to lapse of statute of limitations	—		(149)		(267)
Balance as of December 31,	$	200	$	2,170	$	3,073