Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Apr. 28, 2017
shares
Apr. 27, 2017
USD ($)
shares
Sep. 30, 2018
USD ($)
trading_day
$ / shares
shares
Oct. 10, 2018
$ / shares
Oct. 05, 2018
$ / shares
shares
Oct. 02, 2018
shares
Dec. 31, 2017
$ / shares
shares
Class of Stock [Line Items]              
Securities called by warrant (shares)   4,000,000          
Beneficial conversion feature | $     $ 6.7        
Tema              
Class of Stock [Line Items]              
Warrants exercisable (shares)   4,000,000          
Rosehill Operating              
Class of Stock [Line Items]              
Warrants exercisable (shares)   4,000,000          
PIPE Investment              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)   20,000          
PIPE Investment | Private Placement Warrants              
Class of Stock [Line Items]              
Proceeds from (repurchase of) equity | $   $ 70.8          
Stock issued in transaction (shares)   476,540          
Rosemore Holdings              
Class of Stock [Line Items]              
Public offering proceeds, net of offering costs (funds received and stock issued October 2, 2018) | $   $ 20.0          
Sponsor | Early Bird Capital Inc | Private Placement Warrants              
Class of Stock [Line Items]              
Securities called by warrant (shares)     8,408,838        
Warrant              
Class of Stock [Line Items]              
Securities called by warrant (shares)     588,276        
Class of warrant redemption threshold trading days | trading_day     20        
Period of class of warrant redemption threshold trading days | trading_day     30        
Warrants outstanding (shares)     25,594,158        
Warrant | IPO              
Class of Stock [Line Items]              
Securities called by warrant (shares)     7,597,044        
Warrant | Tema              
Class of Stock [Line Items]              
Securities called by warrant (shares)     4,000,000        
Warrant | PIPE Investors              
Class of Stock [Line Items]              
Securities called by warrant (shares)     5,000,000        
Class B Common Stock              
Class of Stock [Line Items]              
Common stock issued (shares)     29,807,692       29,807,692
Class B Common Stock | Rosehill Operating              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)   29,807,692          
Class A Common Stock              
Class of Stock [Line Items]              
Exercise price of warrants (USD per share) | $ / shares             $ 21.00
Common stock issued (shares)     6,740,852       6,222,299
Class A Common Stock | Rosehill Operating              
Class of Stock [Line Items]              
Warrants exercisable (shares)   4,000,000          
Class A Common Stock | PIPE Investment | Private Placement Warrants              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)   5,000,000          
Class A Common Stock | Common Stock              
Class of Stock [Line Items]              
Exercise price of warrants (USD per share) | $ / shares     $ 18.00        
Class A Common Stock | Common Stock | Sponsor | Securities Subscription Agreement              
Class of Stock [Line Items]              
Conversion of founder stock (shares) 3,475,665            
Class A Common Stock | Warrant              
Class of Stock [Line Items]              
Exercise price of warrants (USD per share) | $ / shares             $ 11.50
8.0% Series A Cumulative Perpetual Preferred Stock              
Class of Stock [Line Items]              
Series A preferred stock, liquidation preference (USD per share) | $ / shares     1,000        
8.0% Series A Cumulative Perpetual Preferred Stock | PIPE Investment              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)   20,000          
8.0% Series A Cumulative Perpetual Preferred Stock | Rosemore Holdings              
Class of Stock [Line Items]              
Public offering proceeds, net of offering costs (funds received and stock issued October 2, 2018) | $   $ 20.0          
8% Series A Cumulative Perpetual Convertible Preferred Stock              
Class of Stock [Line Items]              
Share price (USD per share) | $ / shares     $ 11.5        
Stock issued upon conversion of convertible preferred stock (shares)     86.9565        
Series A Preferred Stock              
Class of Stock [Line Items]              
Series A preferred stock, liquidation preference (USD per share) | $ / shares     $ 1,000       $ 1,000
Series A Preferred Stock | Rosehill Operating              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)   20,000          
Series A Preferred Stock | PIPE Investment              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)   75,000          
Common stock outstanding (as a percent)   30.00%          
Series A Preferred Stock | PIPE Investment | Private Placement Warrants              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)   75,000          
Series A Preferred Stock | Sponsor | Rosemore Holdings              
Class of Stock [Line Items]              
Issuance of preferred stock and warrants (shares)     20,000        
First anniversary              
Class of Stock [Line Items]              
Sale of stock, ownership after transaction (as a percent)     67.00%        
Second anniversary              
Class of Stock [Line Items]              
Sale of stock, ownership after transaction (as a percent)     33.00%        
Minimum | Class A Common Stock | Common Stock              
Class of Stock [Line Items]              
Exercise price of warrants (USD per share) | $ / shares     $ 16.00        
Variable Interest Entity, Not Primary Beneficiary | Tema              
Class of Stock [Line Items]              
Ownership in variable interest entity (as a percent)   83.60% 81.60%        
Subsequent Event | Common Stock Subscribed              
Class of Stock [Line Items]              
Common stock issued (shares)         840,744 6,150,000  
Share price (USD per share) | $ / shares       $ 6.100      
Discount per share on common stock exercise (USD per share) | $ / shares         $ 5.795