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Organization (Details)
3 Months Ended 12 Months Ended
Oct. 14, 2019
shares
Jun. 26, 2019
USD ($)
series_of_warrant
shares
Mar. 31, 2020
USD ($)
segment
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Restructuring Cost and Reserve [Line Items]          
Number of operating segments | segment     1    
Common stock, par value (in dollars per share) | $ / shares     $ 0.001 $ 0.001 $ 0.001
Common Stock warrants exercised (in shares) | shares 2,728,513        
Private Placement          
Restructuring Cost and Reserve [Line Items]          
Sale of common stock (in shares) | shares   2,728,513      
Number of series of warrants | series_of_warrant   4      
Aggregate gross proceeds from sale   $ 20,000,000.0      
Convertible senior notes          
Restructuring Cost and Reserve [Line Items]          
Face value of note     $ 204,000,000   $ 204,000,000
Outstanding debt     186,115,000   184,075,000
Convertible senior notes | Initial Notes | Starboard Value LP          
Restructuring Cost and Reserve [Line Items]          
Face value of note       $ 204,000,000.0  
Cash proceeds       $ 100,000,000.0  
Converted shares issued (in shares) | shares       4,000,000  
Secured Term Note | Secured Term Note          
Restructuring Cost and Reserve [Line Items]          
Face value of note     $ 13,000,000   $ 13,000,000.0
Stated interest rate     9.75%   9.75%
Outstanding debt     $ 12,410,000   $ 12,463,000
Convertible senior notes and Secured Term Note | Initial Notes and Secured Term Note          
Restructuring Cost and Reserve [Line Items]          
Outstanding debt     $ 217,000,000.0