Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets by Major Asset Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross	$ 6,582	$ 1,353
Additions	11,083	5,229
Accumulated amortization	(4,556)	(1,636)
Net book value before impairment	13,109	4,946
Impairment charge	(411)	(411)
Net book value	12,698	4,535
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	2,518	265
Additions	2,882	2,253
Accumulated amortization	(1,612)	(687)
Net book value before impairment	3,788	1,831
Net book value	3,788	1,831
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	3,975	999
Additions		2,976
Accumulated amortization	(1,158)	(860)
Net book value before impairment	2,817	3,115
Impairment charge	(411)	(411)
Net book value	$ 2,406	$ 2,704
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	6 years
Additions	$ 7,000
Accumulated amortization	(1,242)
Net book value before impairment	5,758
Net book value	$ 5,758
Trademarks/Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	2 years	2 years
Gross	$ 38	$ 38
Accumulated amortization	$ (38)	$ (38)
Non-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years	3 years
Gross	$ 51	$ 51
Additions	232
Accumulated amortization	(119)	$ (51)
Net book value before impairment	164
Net book value	$ 164
Support Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
Additions	$ 369
Accumulated amortization	(323)
Net book value before impairment	46
Net book value	$ 46
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Additions	$ 600
Accumulated amortization	(64)
Net book value before impairment	536
Net book value	$ 536
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
Minimum [Member] | Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	4 years	4 years
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years	3 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Maximum [Member] | Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	8 years	6 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years	10 years