Business Combinations and Disposals - Acquisitions (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 31, 2020	Jul. 23, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Common stock options available for future grants	11,137,824		11,137,824
Intangible assets:
Goodwill	$ 28,289		$ 28,289	$ 18,274	$ 21,305
Customer relationships
Business Acquisition [Line Items]
Weighted-average amortization useful life			5 years
Acquired technology
Business Acquisition [Line Items]
Weighted-average amortization useful life			9 years
Trademarks and tradenames
Business Acquisition [Line Items]
Weighted-average amortization useful life			13 years
Non-compete agreements
Business Acquisition [Line Items]
Weighted-average amortization useful life			2 years
Total Acquisition
Purchase consideration:
Cash			$ 8,328
Issuance of common stock			6,859
Deferred acquisition consideration			80
Notes payable			607
Contingent consideration	1,749		1,749
Total purchase consideration:			17,623
Assets:
Cash and cash equivalents	537		537
Current assets	773		773
Property and equipment	258		258
Intangible assets:
Goodwill	10,176		10,176
Total assets acquired	21,089		21,089
Current liabilities	(1,733)		(1,733)
Deferred tax liabilities, net	(1,733)		(1,733)
Net assets acquired	17,623		17,623
Total Acquisition | Customer relationships
Intangible assets:
Intangible assets	3,140		3,140
Total Acquisition | Acquired technology
Intangible assets:
Intangible assets	4,470		4,470
Total Acquisition | Trademarks and tradenames
Intangible assets:
Intangible assets	1,510		1,510
Total Acquisition | Non-compete agreements
Intangible assets:
Intangible assets	225		225
July 23, 2020 Acquisition
Purchase consideration:
Cash		$ 2,000
Issuance of common stock		1,790
Total purchase consideration:		3,790
Assets:
Cash and cash equivalents		382
Current assets		554
Property and equipment		212
Intangible assets:
Goodwill		1,576
Total assets acquired		4,674
Current liabilities		(884)
Net assets acquired		3,790
July 23, 2020 Acquisition | Customer relationships
Intangible assets:
Intangible assets		740
July 23, 2020 Acquisition | Acquired technology
Intangible assets:
Intangible assets		470
July 23, 2020 Acquisition | Trademarks and tradenames
Intangible assets:
Intangible assets		670
July 23, 2020 Acquisition | Non-compete agreements
Intangible assets:
Intangible assets		$ 70
December 31, 2020 Acquisition
Purchase consideration:
Cash	6,003
Issuance of common stock	4,711
Contingent consideration	1,749		1,749
Total purchase consideration:	12,463
Assets:
Cash and cash equivalents	119		119
Current assets	212		212
Property and equipment	44		44
Intangible assets:
Goodwill	7,242		7,242
Total assets acquired	14,472		14,472
Current liabilities	(322)		(322)
Deferred tax liabilities, net	(1,687)		(1,687)
Net assets acquired	12,463		12,463
December 31, 2020 Acquisition | Customer relationships
Intangible assets:
Intangible assets	2,400		2,400
December 31, 2020 Acquisition | Acquired technology
Intangible assets:
Intangible assets	3,700		3,700
December 31, 2020 Acquisition | Trademarks and tradenames
Intangible assets:
Intangible assets	600		600
December 31, 2020 Acquisition | Non-compete agreements
Intangible assets:
Intangible assets	155		155
Other Acquisitions
Purchase consideration:
Cash			325
Issuance of common stock			358
Deferred acquisition consideration			80
Notes payable			607
Total purchase consideration:			1,370
Assets:
Cash and cash equivalents	36		36
Current assets	7		7
Property and equipment	2		2
Intangible assets:
Goodwill	1,358		1,358
Total assets acquired	1,943		1,943
Current liabilities	(527)		(527)
Deferred tax liabilities, net	(46)		(46)
Net assets acquired	1,370		1,370
Other Acquisitions | Acquired technology
Intangible assets:
Intangible assets	300		300
Other Acquisitions | Trademarks and tradenames
Intangible assets:
Intangible assets	$ 240		$ 240