Stockholder's Equity (Details) $ in Thousands	1 Months Ended	9 Months Ended
	May 31, 2018 USD ($)	Sep. 30, 2019 USD ($) class	Sep. 30, 2018 USD ($)
Stockholders' Equity
Number of classes of common stock | class		3
Proceeds from Disgorgement of Short Swing Profits			$ 557
M L Acquisition Company LLC And M L Related Parties
Stockholders' Equity
Proceeds from Disgorgement of Short Swing Profits	$ 557
Class B common stock
Stockholders' Equity
Consideration for redemption of shares		$ 0