Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Changes in goodwill
Beginning balance			$ 3,961
Ending balance	$ 45,658		$ 45,658		$ 3,961
Total intangible assets
Weighted Average Amortization Period (Years)			10 years 6 months		13 years 2 months 12 days
Gross Intangible Assets	15,339		$ 15,339		$ 10,724
Accumulated Amortization	(6,893)		(6,893)		(6,219)
Net Intangible Assets	8,446		8,446		4,505
Amortization expense for intangible assets	200	$ 200	700	$ 700
Estimated future amortization expense of intangible assets
Remaining period in 2021 (three months)	611		611
Year ended December 31, 2022	2,057		2,057
Year ended December 31, 2023	1,659		1,659
Year ended December 31, 2024	1,442		1,442
Year ended December 31, 2025	1,017		1,017
Thereafter	1,660		1,660
Net Intangible Assets	8,446		$ 8,446		$ 4,505
Trade and domain names
Total intangible assets
Weighted Average Amortization Period (Years)			14 years 3 months 18 days		15 years
Gross Intangible Assets	7,713		$ 7,713		$ 7,255
Accumulated Amortization	(3,917)		(3,917)		(3,556)
Net Intangible Assets	3,796		3,796		3,699
Estimated future amortization expense of intangible assets
Net Intangible Assets	3,796		$ 3,796		$ 3,699
Software technology
Total intangible assets
Weighted Average Amortization Period (Years)			7 years 8 months 12 days		9 years 4 months 24 days
Gross Intangible Assets	5,694		$ 5,694		$ 3,469
Accumulated Amortization	(2,976)		(2,976)		(2,663)
Net Intangible Assets	2,718		2,718		806
Estimated future amortization expense of intangible assets
Net Intangible Assets	2,718		$ 2,718		$ 806
Customer relationships
Total intangible assets
Weighted Average Amortization Period (Years)			3 years 4 months 24 days
Gross Intangible Assets	1,932		$ 1,932
Accumulated Amortization	0		0
Net Intangible Assets	1,932		1,932
Estimated future amortization expense of intangible assets
Net Intangible Assets	$ 1,932		1,932
TLH
Changes in goodwill
Acquisition of			14,648
Sprout
Changes in goodwill
Acquisition of			$ 27,049