Income Taxes - Schedule of Components of Company's Net Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Accrued liabilities	$ 12,229	$ 18,670
Depreciation and amortization	1,121	872
Foreign operating loss carryforward	447	248
U.S. state and local tax credits and carryforward	184	223
Other	96	41
Valuation allowance	(755)	(169)
Total deferred tax assets	13,322	19,885
Deferred tax liabilities:
Depreciation and amortization	(21,787)	(18,803)
Prepaid expenses	(808)	(550)
Advanced billings	(3,147)	0
Other	(53)	(258)
Total deferred tax liabilities	(25,795)	(19,611)
Net deferred tax liability	$ (12,473)
Net deferred tax asset		$ 274