Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets [Abstract]
Accrued liabilities	$ 1,473	$ 1,545
Operating lease liabilities	7,195	5,060
Allowance for doubtful accounts	273	119
Net operating losses	203	287
Deferred compensation liability	2,511	2,324
Intangible assets	1,844	7,946
Total deferred tax assets	13,499	17,281
Deferred Tax Liabilities [Abstract]
Prepaid expenses	1,206	1,044
Accounting method change	10	20
Foreign exchange adjustments	1,828	0
Goodwill and intangible assets	23,027	20,999
Operating lease right-of-use assets	6,909	4,798
Property and equipment	1,430	1,528
Total deferred tax liabilities	34,410	28,389
Net deferred tax liability	$ 20,911	$ 11,108