Goodwill and Acquired Intangible Assets, Net - Total Expected Future Amortization Expense for Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 10,443
2021	10,197
2022	8,202
2023	7,709
Thereafter	12,607
Total expected future amortization expense	$ 49,158	$ 59,973