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Acquisitions - 2019 Acquisitions (Details) - Thinkful, Inc - USD ($) $ in Thousands		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Business Acquisition [Line Items]
Fair value of purchase consideration	$ 79,200
Total fair value of purchase consideration	79,200
Escrow	$ 9,000
Escrow release period after acquisition	18 months
Contingent consideration arrangements	$ 20,000			$ 12,800
Contingent purchase consideration, cash		$ 3,000		$ 5,700
Acquisition related expenses		1,000
Consolidated net loss attributed to acquiree since acquisition date		8,600
Pro forma net income loss		$ 25,000	$ 38,600

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