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Stockholder's Equity and Stock-based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
Dec. 01, 2018
$ / shares
shares
May 30, 2018
$ / shares
shares
Feb. 21, 2018
$ / shares
shares
Dec. 14, 2017
$ / shares
shares
Mar. 01, 2016
individual
$ / shares
shares
Feb. 04, 2016
Mar. 01, 2015
individual
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
$ / shares
Nov. 30, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Additional warrants purchased (in shares) | shares     1,820,000                      
Net proceeds from issuance of stocks | $                   $ 46,999,000 $ 0 $ 0    
Extinguishment of debt | $               $ 28,500,000            
Warrants exercise price (usd per share)     $ 33.60                      
Total intrinsic value of options exercised | $                   1,400,000 100,000 100,000    
Cash received from option exercises | $                   $ 200,000 $ 100,000 $ 0    
Weighted average grant date fair value for stock option awards (usd per share)                   $ 15.23 $ 8.10 $ 2.04    
Term of common stock used in determining market-based implied volatility                   6 months        
Stock available for issuance (in shares) | shares                           1,700,000
Outstanding, maximum (usd per share)                   $ 151.35 245.85 245.85 $ 245.85  
Outstanding, minimum (usd per share)                   $ 3.10 $ 3.10 $ 3.10 $ 34.20  
Reverse stock split ratio of one share           0.066667                
Exercise of stock options (in shares) | shares                   70,086 15,000      
Stock-based compensation expense | $                   $ 3,337,000 $ 2,552,000 $ 3,267,000    
2013 LTIP                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock available for issuance (in shares) | shares                           1,200,000
Equity Investment Program                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common stock purchased to restricted stock issued, ratio                 0.2          
Equity Investment Program | Executive officers and other key employees                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options, award vesting period                   90 days        
Number of common stock shares sold (in shares) | shares       219,346                    
Equity Investment Program | Private placement                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Price per share of common stock share sold (usd per share)       $ 13.05                    
Number of common stock shares sold (in shares) | shares       120,567                    
Stock options                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options, award vesting period                   4 years        
Stock options, term in years                   10 years        
Restricted stock and restricted stock unit                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Public equity offering (in shares) | shares 900,002                          
Stock options, award vesting period                   3 years        
Weighted average price limit in vesting period (usd per share)   $ 24.75                        
Intrinsic value of restricted stock and restricted stock unit awards | $                 $ 4,000,000 $ 5,400,000 $ 4,000,000 $ 1,700,000    
Weighted average grant date fair value for restricted stock and restricted stock unit awards (usd per share)                   $ 10.60 $ 11.36 $ 3.81    
Total fair value of shares vested | $                   $ 3,800,000 $ 600,000 $ 200,000    
Shares vested (in shares) | shares   43,865               151,852        
Restricted stock and restricted stock unit | First one-third of awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Weighted average grant date fair value for stock option awards (usd per share) $ 7.19                          
Weighted average price limit in vesting period (usd per share) 17.50                          
Restricted stock and restricted stock unit | Second one-third of awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Weighted average grant date fair value for stock option awards (usd per share) 6.51                          
Weighted average price limit in vesting period (usd per share) 22.50                          
Restricted stock and restricted stock unit | Final one-third of awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Weighted average grant date fair value for stock option awards (usd per share) 5.89                          
Weighted average price limit in vesting period (usd per share) $ 27.50                          
Stock appreciation rights (SARs)                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Public equity offering (in shares) | shares 960,009                          
Stock options, award vesting period         4 years   4 years              
Stock options, term in years                   10 years        
Weighted average grant date fair value for stock option awards (usd per share)                   $ 8.85   $ 17.55    
Exercise price of awards issued during period $ 8.85       $ 3.1   $ 34.20              
Maximum value of SARs (in dollars per share)                   18.65   19.40    
Outstanding, maximum (usd per share)                   27.50   22.50    
Outstanding, minimum (usd per share)                   $ 8.85   $ 3.10    
Number of awards issued during period | shares         1,210,000   207,207              
Number of individuals that received SARs | individual         15   16              
Percentage of fair market value of shares for calculation of exercise price SAR                   100.00%        
Percentage of shares allowed to be exercised annually, if vested         33.33%   33.33%              
Exercise of stock options (in shares) | shares                   34,999 713,330      
Number of days volume-weighted average price of stock measured for vesting             20 days              
Stock-based compensation expense | $                   $ 800,000 $ 6,600,000 $ 500,000    
Stock appreciation rights (SARs) | Equity Investment Program                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Exercise of stock options (in shares) | shares                   663,330        
Participants gain on exercises of awards (usd per share)                   $ 9.95        
Stock appreciation rights (SARs) | First one-third of awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Annual vesting percentage         33.33%   33.33%              
Percentage that weighted average price of common stock must be greater than exercise price of SARs         120.00%   120.00%              
Stock appreciation rights (SARs) | Second one-third of awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Annual vesting percentage         33.33%   33.33%              
Percentage that weighted average price of common stock must be greater than exercise price of SARs         125.00%   125.00%              
Stock appreciation rights (SARs) | Final one-third of awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Annual vesting percentage         33.33%   33.33%              
Percentage that weighted average price of common stock must be greater than exercise price of SARs         130.00%   130.00%              
Common Stock                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Public equity offering (in shares) | shares     1,820,000             1,820,000        
Price per share of common stock share sold (usd per share)     $ 27.5                      
Exercise of stock options (in shares) | shares                   70,086 15,000