Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable	$ 36,385	$ 12,594
Investment banking fees, commissions and other receivables	8,043	26,581
Unbilled receivables	3,710	3,644
Total accounts receivable	48,138	42,819
Allowance for doubtful accounts	(1,514)	(696)
Accounts receivable, net	$ 46,624	$ 42,123