Cash, Cash Equivalents, and Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		$ 492,350
Amortized Cost	$ 515,026
Gross Unrealized Gains		5
Gross Unrealized Gains	1
Gross Unrealized Losses		(18,101)
Gross Unrealized Losses	(33,305)
Fair Value		474,254
Fair Value	481,722
Cash and Cash Equivalents	386,367	356,332
Marketable Securities	57,600	72,180
Short-Term Investments	20,024	14,510
Long-Term Investments	17,731	31,232
Cash and cash equivalents	386,367	356,332	$ 154,822
Short-term investments	20,024	14,510
Long-term investments	17,731	31,232
Share Purchase Agreement with Cellebrite DI Ltd.
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable securities, unrealized gain (loss)	(14,600)
Common stock | Share Purchase Agreement with Cellebrite DI Ltd.
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable Securities		$ 90,000
Investment owned, shares held		9,000,000
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		$ 103,544
Amortized Cost	105,036
Gross Unrealized Gains		4
Gross Unrealized Gains	1
Gross Unrealized Losses		(17,820)
Gross Unrealized Losses	(32,400)
Fair Value		85,728
Fair Value	72,637
Cash and Cash Equivalents	10,336	2,844
Marketable Securities	57,600	72,180
Short-Term Investments	4,701	10,704
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		35,318
Amortized Cost	33,959
Gross Unrealized Gains		1
Gross Unrealized Losses		(281)
Gross Unrealized Losses	(905)
Fair Value		35,038
Fair Value	33,054
Short-Term Investments	15,323	3,806
Long-Term Investments	17,731	31,232
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		353,488
Amortized Cost	376,031
Fair Value		353,488
Fair Value	376,031
Cash and Cash Equivalents	376,031	353,488
Money market funds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		2,844
Amortized Cost	10,336
Fair Value		2,844
Fair Value	10,336
Cash and Cash Equivalents	10,336	2,844
Agency bonds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		10,700
Amortized Cost	4,700
Gross Unrealized Gains		4
Gross Unrealized Gains	1
Fair Value		10,704
Fair Value	4,701
Short-Term Investments	4,701	10,704
Marketable securities | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		90,000
Amortized Cost	90,000
Gross Unrealized Losses		(17,820)
Gross Unrealized Losses	(32,400)
Fair Value		72,180
Fair Value	57,600
Marketable Securities	57,600	72,180
State and municipal obligations | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		2,570
Amortized Cost	2,550
Gross Unrealized Losses		(5)
Gross Unrealized Losses	(30)
Fair Value		2,565
Fair Value	2,520
Short-Term Investments	1,759	1,400
Long-Term Investments	761	1,165
Corporate bonds | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		32,748
Amortized Cost	31,409
Gross Unrealized Gains		1
Gross Unrealized Losses		(276)
Gross Unrealized Losses	(875)
Fair Value		32,473
Fair Value	30,534
Short-Term Investments	13,564	2,406
Long-Term Investments	$ 16,970	$ 30,067