Subsequent Event (Details) - Subsequent Event - Learning Technologies Group plc $ / shares in Units, $ in Thousands	Jul. 15, 2021 USD ($) $ / shares
Subsequent Event [Line Items]
Acquisition price per share of common stock (in dollars per share) | $ / shares	$ 20.85
Anticipated gain (loss) on contract termination fee	$ 12,000
Learning Technologies Group plc
Subsequent Event [Line Items]
Anticipated gain (loss) on contract termination fee	$ 12,000
Market capitalization, percentage	0.01
Maximum
Subsequent Event [Line Items]
Contingent expense reimbursement	$ (1,200)
Maximum | Learning Technologies Group plc
Subsequent Event [Line Items]
Contingent expense reimbursement for current fiscal year	$ 5,000