Consolidated Statements of Changes in Shareholders' Equity/Members' Deficit - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total	Preferred A Interests Units [Member]	Preferred A-1 Interests Units [Member]	Common Interests [Member]
Balance at Dec. 31, 2016	$ 0	$ 1,460	$ (108,670)	$ (57,197)	$ 16,887	$ 21,883	$ 11,243
Balance (in shares) at Dec. 31, 2016	0				16,886,750	21,526,850	118,785,104
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on preferred interests	$ 0	0	(2,480)	(2,480)	$ 0	$ 0	$ 0
Issuance of common interests upon exercise of warrants	$ 0	(1,460)	0	24	$ 0	$ 0	$ 1,484
Issuance of common interests upon exercise of warrants (in shares)	0				0	0	2,443,249
Net loss	$ 0	0	(8,943)	(8,943)	$ 0	$ 0	$ 0
Balance at Dec. 31, 2017	$ 0	0	(120,093)	(68,596)	$ 16,887	$ 21,883	$ 12,727
Balance (in shares) at Dec. 31, 2017	0				16,886,750	21,526,850	121,228,353
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reorganization to C-Corporation	$ 0	(26,495)	120,093	42,101	$ (16,887)	$ (21,883)	$ (12,727)
Reorganization to C-Corporation (in shares)	5,000				(16,886,750)	(21,526,850)	(121,228,353)
Effect of Stock Split	$ 15	(15)	0	0	$ 0	$ 0	$ 0
Effect of Stock Split (in shares)	15,072,647				0	0	0
Common Stock issued to performance unit plan participants	$ 5	19,118	0	19,123	$ 0	$ 0	$ 0
Common Stock issued to performance unit plan participants (in shares)	4,922,353				0	0	0
Reclassification of warrant liability to equity	$ 0	12,952	0	12,952	$ 0	$ 0	$ 0
Cash received for warrant exercise	0	116	0	116	0	0	0
Common Stock issued related to initial public offering	$ 5	68,709	0	68,714	$ 0	$ 0	$ 0
Common Stock issued related to initial public offering (in shares)	4,925,727				0	0	0
Issuance costs related to initial public offering	$ 0	(5,232)	0	(5,232)	$ 0	$ 0	$ 0
Issuance costs related to initial public offering (in shares)	0				0	0	0
Share-based compensation	$ 0	2,278	0	2,278	$ 0	$ 0	$ 0
Share-based compensation (in shares)	31,582
Net loss	$ 0	0	(61,376)	(61,376)	0	0	0
Balance at Dec. 31, 2018	$ 25	$ 71,431	$ (61,376)	$ 10,080	$ 0	$ 0	$ 0
Balance (in shares) at Dec. 31, 2018	24,957,309				0	0	0