Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

v3.19.1
Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jul. 27, 2018
Jul. 12, 2018
$ / shares
shares
Feb. 28, 2018
$ / shares
Feb. 28, 2017
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Class of Stock [Line Items]            
Common stock, par value (in dollars per share) | $ / shares         $ 0.16667 $ 0.16667
Preferred stock, par value (in dollars per share) | $ / shares   $ 1.0     1 1
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares         $ 100.0 $ 100.0
Issuance of common stock and issuance of mandatory convertible preferred stock | $       $ 72,300    
Conversion rate, measurement period         20 days  
Preferred stock, dividends declared (in dollars per share) | $ / shares     $ 1.8125   $ 1.8125  
Rights, exercise price (in dollars per share) | $ / shares   $ 52.5        
Period following public announcement of acquisition of 10% or more of outstanding shares   10 days        
Percentage threshold for triggering event   4.90%        
Period following tender offer for acquisition   10 days        
Discount on share price if rights are exercisable   50.00%        
Number of shares exchangeable if right become exercisable | shares   2        
Reverse stock split ratio 15          
Common Stock            
Class of Stock [Line Items]            
Common stock, shares issued | shares       800,000   800,000 [1]
Pre-split shares issued (in shares) | shares       12,000,000    
Shares issued, price per share (in dollars per share) | $ / shares       $ 2.1    
Issuance of common stock and issuance of mandatory convertible preferred stock | $           $ 24,059
Common Stock | Maximum            
Class of Stock [Line Items]            
Conversion rate (in shares) | shares         3.2  
Common Stock | Minimum            
Class of Stock [Line Items]            
Conversion rate (in shares) | shares         2.8  
Convertible Preferred Stock            
Class of Stock [Line Items]            
Common stock, shares issued | shares       500,000   500,000 [1]
Issuance of common stock and issuance of mandatory convertible preferred stock | $           $ 48,277
Series A Mandatory Convertible Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, stated interest rate         7.25% 7.25%
[1] See Note 12 - Stockholders' Equity for details regarding the 1-for-15 reverse stock split.