Discontinued Operations - Major Classes of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Total current assets	$ 0	$ 66,604
Current liabilities:
Total current liabilities	$ 0	6,548
Brainspace
Current assets:
Cash		27
Accounts receivable, net of allowance of $97		5,202
Accounts receivable, allowance		97
Contract assets		208
Deferred contract acquisition costs, current		979
Total current assets		6,416
Contract assets, noncurrent		8,419
Deferred contract acquisition costs, noncurrent		2,315
Goodwill		33,696
Intangible assets, net		15,758
Total assets		66,604
Current liabilities:
Accounts payable		128
Accrued expenses		4,993
Deferred revenue		1,247
Total current liabilities		6,368
Other liabilities		180
Total liabilities		6,548
Net assets		$ 60,056