Stockholder's Equity - Initial Public Offering (Details) - USD ($)							1 Months Ended		12 Months Ended
	Nov. 01, 2017	Oct. 30, 2017	Jun. 09, 2017	Jun. 05, 2017	Nov. 09, 2016	Oct. 13, 2016	May 31, 2018	May 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 10, 2016
IPO
Proceeds from issuance of common stock			$ 16,000,000
Proceeds from short-swing profit disgorgement									$ 557,000
M L Acquisition Company LLC And M L Related Parties
IPO
Proceeds from short-swing profit disgorgement							$ 557,000
CWGS, LLC
IPO
Purchase of newly-issued common units			600,000					4,000,000
Class A common stock
IPO
Number of shares issued								4,000,000		4,600,000	11,872,000
Offering price (in dollars per share)								$ 27.75
Proceeds from IPO											$ 234,185,000
Common stock, outstanding									37,192,364	36,749,072	18,936,000	18,935,916
Proceeds from issuance of common stock								$ 106,600,000
Class A common stock | CWH BR Merger
IPO
Common stock, outstanding												7,063,716
Class A common stock | May 2017 Selling Stockholders
IPO
Offering price (in dollars per share)								$ 27.75
Shares issued by selling stockholders			825,000					5,500,000
Class A common stock | CVRV Acquisition LLC
IPO
Shares of common stock redeemed for shares of common stock			648,462					4,323,083
Redemption of common stock by selling shareholders		4,715,529
Shares sold that were previously held			176,538
Class A common stock | CVRV Acquisition II LLC
IPO
Shares sold that were previously held	184,669	1,283,756						1,176,917
Class A common stock | October 2017 Selling Stockholders
IPO
Number of shares issued		6,700,000
Offering price (in dollars per share)		$ 40.50
Shares issued by selling stockholders	963,799
Class A common stock | Crestview Advisors LLC
IPO
Shares sold that were previously held	104	715
Class A common stock | CWGS Holding, LLC and CVRV Acquisition LLC
IPO
Shares of common stock redeemed for shares of common stock	678,331
Redemption of common stock by selling shareholders	678,331
Class A common stock | CWGS, LLC | CVRV Acquisition LLC
IPO
Shares of common stock redeemed for shares of common stock		4,715,529
Redemption of common stock by selling shareholders								4,323,083
Class A common stock | CWGS, LLC | October 2017 Selling Stockholders
IPO
Redemption of common stock by selling shareholders		700,000
Class A common stock | CWGS, LLC | CWGS Holding, LLC and CVRV Acquisition LLC
IPO
Shares of common stock redeemed for shares of common stock	100,695
Redemption of common stock by selling shareholders	100,695	700,000
Class B common stock
IPO
Common stock, outstanding									50,706,629	50,836,629	62,003,000	62,002,729
Consideration for redemption of shares	$ 0
Class B common stock | May 2017 Selling Stockholders
IPO
Consideration for redemption of shares			$ 0					$ 0
Class B common stock | CVRV Acquisition LLC
IPO
Number of common stock cancelled	678,331	4,715,529	648,462					4,323,083
Class B common stock | CWGS Holding LLC
IPO
Number of common stock cancelled	100,695	700,000
Class B common stock | October 2017 Selling Stockholders
IPO
Consideration for redemption of shares		$ 0
Class B common stock | CWGS, LLC | CVRV Acquisition LLC
IPO
Redemption of common stock by selling shareholders			648,462
Class C common stock
IPO
Common stock, outstanding									1	1		1
IPO | Class A common stock
IPO
Number of shares issued						11,363,636
Offering price (in dollars per share)						$ 22.00
Proceeds from IPO						$ 233,400,000
Common stock, outstanding												11,872,200
IPO | Class A common stock | CWGS, LLC
IPO
Units issued in exchange						11,363,636
Over allotment | October 2017 Selling Stockholders
IPO
Shares issued by selling stockholders		1,005,000
Over allotment | Class A common stock
IPO
Number of shares issued			600,000	600,000	508,564
Proceeds from IPO					$ 10,400,000
Over allotment | Class A common stock | May 2017 Selling Stockholders
IPO
Shares issued by selling stockholders				825,000
Over allotment | Class A common stock | October 2017 Selling Stockholders
IPO
Shares issued by selling stockholders		963,799
Over allotment | Class A common stock | CWGS, LLC
IPO
Units issued in exchange					508,564