Acquisitions (Details) - USD ($) $ in Thousands	Dec. 16, 2019	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Purchase Price Allocation
Goodwill		$ 161,698	$ 159,038
First Leads
Business Acquisition [Line Items]
Cash consideration	$ 15,000
Marketing funds
Purchase Price Allocation
Restricted cash				$ 28,495
Other current assets				8,472
Property and equipment				788
Other assets, net of current portion				126
Total assets acquired				37,881
Other current liabilities				37,881
Total liabilities assumed				$ 37,881