Cash, Cash Equivalents, and Investments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 637,778	$ 637,778	$ 652,816
Gross Unrealized Gains	129	129	401
Gross Unrealized Losses	(6,777)	(6,777)	(128)
Fair Value	631,130	631,130	653,089
Cash and Cash Equivalents	281,703	281,703	155,443
Marketable Securities	83,340	83,340
Short-Term Investments	216,628	216,628	406,667
Long-Term Investments	49,447	49,447	90,706
Expected credit loss reserve	(100)	(100)	200
Cash and cash equivalents	281,691	281,691	155,440	$ 176,000
Short-term investments	216,557	216,557	406,525
Long-term investments	49,431	49,431	90,681
Marketable securities, unrealized gain (loss)	(6,700)	(6,700)
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	257,225	257,225	183,789
Gross Unrealized Gains	49	49	128
Gross Unrealized Losses	(6,660)	(6,660)
Fair Value	250,614	250,614	183,917
Cash and Cash Equivalents	119,225	119,225	23,611
Marketable Securities	83,340	83,340
Short-Term Investments	40,000	40,000	120,178
Long-Term Investments	8,000	8,000	40,000
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	218,075	218,075	352,920
Gross Unrealized Gains	80	80	273
Gross Unrealized Losses	(117)	(117)	(128)
Fair Value	218,038	218,038	353,065
Cash and Cash Equivalents			15,725
Short-Term Investments	176,628	176,628	286,489
Long-Term Investments	41,447	41,447	50,706
Cash and Cash Equivalents
Restricted Cash and Cash Equivalents Items [Line Items]
Expected credit loss reserve	(12)	(12)	(3)
Short-Term Investments
Restricted Cash and Cash Equivalents Items [Line Items]
Expected credit loss reserve	(71)	(71)	(142)
Long-Term Investments
Restricted Cash and Cash Equivalents Items [Line Items]
Expected credit loss reserve	(16)	(16)	(25)
Common stock | Share Purchase Agreement with Cellebrite DI Ltd.
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable Securities	$ 90,000	$ 90,000
Investment owned, shares held	9,000,000	9,000,000
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 162,478	$ 162,478	116,107
Fair Value	162,478	162,478	116,107
Cash and Cash Equivalents	162,478	162,478	116,107
Money market funds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	119,225	119,225	23,611
Fair Value	119,225	119,225	23,611
Cash and Cash Equivalents	119,225	119,225	23,611
Agency bonds | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	48,000	48,000	63,794
Gross Unrealized Gains	49	49	122
Fair Value	48,049	48,049	63,916
Short-Term Investments	40,000	40,000	23,794
Long-Term Investments	8,000	8,000	40,000
Marketable securities | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	90,000	90,000
Gross Unrealized Losses	(6,660)	(6,660)
Fair Value	83,340	83,340
Marketable Securities	83,340	83,340
Treasury bills | Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			96,384
Gross Unrealized Gains			6
Fair Value			96,390
Short-Term Investments			96,384
State and municipal obligations | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	77,764	77,764	77,130
Gross Unrealized Gains	4	4	25
Gross Unrealized Losses	(22)	(22)	(28)
Fair Value	77,746	77,746	77,127
Short-Term Investments	72,383	72,383	66,519
Long-Term Investments	5,381	5,381	10,611
Certificates of deposit | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	500	500	500
Fair Value	500	500	500
Short-Term Investments	500	500	500
Corporate bonds | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	119,817	119,817	212,825
Gross Unrealized Gains	76	76	232
Gross Unrealized Losses	(95)	(95)	(100)
Fair Value	119,798	119,798	212,957
Cash and Cash Equivalents			2,525
Short-Term Investments	83,751	83,751	170,205
Long-Term Investments	36,066	36,066	40,095
U.S. Treasury repurchase agreements | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			13,200
Fair Value			13,200
Cash and Cash Equivalents			13,200
Treasury inflation - protected securities | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			3,291
Gross Unrealized Gains			16
Fair Value			3,307
Short-Term Investments			3,291
Commercial paper | Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	19,994	19,994	45,974
Fair Value	19,994	19,994	45,974
Short-Term Investments	$ 19,994	$ 19,994	$ 45,974