Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Total	Class A Voting Common Stock	Series A-1 Preferred Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance at Dec. 31, 2017	$ 203,690	$ 142,655		$ 174,871	$ (113,836)
Beginning balance (in shares) at Dec. 31, 2017		24,506,647	83,968
Payment-in-kind dividends (in shares)			1,889
Issued pursuant to stock-based compensation plan	(610)			(610)
Issued pursuant to stock-based compensation plan (in shares)		127,666
Stock-based compensation	216			216
Net loss	(16,536)				(16,536)
Ending balance at Mar. 31, 2018	$ 186,760	$ 142,655		$ 174,477	$ (130,372)
Ending balance (in shares) at Mar. 31, 2018		24,634,313	85,857