Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Level 1 | Fair Value, Measurements, Recurring
Liabilities:
Contingent consideration	$ 0	$ 0
Total	0	0
Level 2 | Fair Value, Measurements, Recurring
Liabilities:
Contingent consideration	0	0
Total	0	0
Level 3 | Fair Value, Measurements, Recurring
Liabilities:
Contingent consideration	1,036	1,056
Total	1,036	$ 1,056
Monte Carlo Simulation Valuation Model
Liabilities:
Undiscounted maximum payment under the contingent consideration arrangements	$ 1,200