Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accounts receivable and financing receivables	$ 625	$ 773
Accrued vacation	678	691
Stock-based compensation	1,905	2,568
Deferred revenue	988	283
Accrued severance	44	4
Accrued liabilities	15	0
Credits	2,472	3,274
Net operating loss	3,560	4,301
Deferred tax assets	12,027	11,894
Less: Valuation allowance	622	636
Total deferred tax assets	11,405	11,258
Deferred tax liabilities:
Intangible assets	18,002	19,603
Accrued liabilities and other	4,668	956
Fixed assets	875	1,077
Total deferred tax liabilities	25,285	21,636
Total net deferred tax liability	$ (13,880)	$ (10,378)