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Convertible Notes and Term Loan - Convertible Notes - Additional Information (Details)
3 Months Ended
Feb. 29, 2016
USD ($)
d
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
KKR Member      
Debt Instrument [Line Items]      
Aggregate principal amount $ 20,000,000    
MX II Member      
Debt Instrument [Line Items]      
Aggregate principal amount 4,000,000    
KMGCP Member      
Debt Instrument [Line Items]      
Aggregate principal amount 1,000,000    
HRP III Member      
Debt Instrument [Line Items]      
Aggregate principal amount 75,000,000    
8.2% Senior Convertible Notes Due 2022      
Debt Instrument [Line Items]      
Aggregate principal amount $ 100,000,000    
Convertible notes, interest rate 8.20%    
Convertible notes, interest rate description   The Convertible Notes bear interest at a fixed coupon rate of 8.2% per annum payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year, which commenced on March 31, 2016  
Debt instrument maturity date Mar. 31, 2022    
Convertible notes, premium percentage 9.00%    
Common shares at conversion | shares 44.7387    
Conversion price per common share | $ / shares $ 22.35    
Principal amount of notes converted into shares $ 1,000    
Percentage of applicable conversion price 160.00%    
Convertible trading days | d 20    
Convertible consecutive trading days | d 30    
Percentage to pay in cash of the par value of notes 109.00%    
Convertible notes, covenant compliance   As of March 31, 2019, the Company was in full compliance with these covenants and there were no events of default under the Convertible Notes.  
Convertible notes, converted amount   $ 61,000,000  
Closing stock, price per share | $ / shares   $ 13.64  
Unamortized debt discount and debt issuance costs on Convertible Notes   $ 5,514,000  
Amortized effective interest rate convertible notes period   3 years  
Convertible notes, effective interest rate   9.48%  
Total interest expense related to accrued interest and amortization of debt discount   $ 2,400,000 $ 2,400,000