Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Stock-based compensation	$ 8,056	$ 9,545
Goodwill and intangible assets	5,516	5,874
Accounts receivable, net	4,442	3,537
Deferred rent	0	696
Tenant improvements	0	569
Liability for appeals	931	5,632
Net operating loss carry-forwards	2,644	1,527
Tax credit carry-forwards	1,815	4,076
Property and equipment	139	49
Accrued expenses and other	5,054	7,839
ROU Liability	5,799
Total deferred tax assets	34,396	39,344
Deferred tax liabilities:
Goodwill and intangible assets	42,894	43,400
Section 481(a) adjustment	2,551	5,073
Prepaid expenses	734	668
Capitalized software cost	9,068	8,688
ROU Asset	4,736
Total deferred tax liabilities	59,983	57,829
Total net deferred tax liabilities	$ 25,587	$ 18,485