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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Nov. 09, 2018
Oct. 12, 2018
Mar. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Class Of Stock [Line Items]          
Preferred stock, shares authorized       5,000,000 5,000,000
Preferred stock, par value, per share       $ 0.001 $ 0.001
Common stock, shares authorized       100,000,000 100,000,000
Common stock, par value, per share       $ 0.001 $ 0.001
Preferred stock, shares issued       839,200 839,200
Preferred stock, shares outstanding       839,200 839,200
Cash dividend paid to holders       $ 511  
Common Stock          
Class Of Stock [Line Items]          
Cash dividend paid to holders       $ 0  
Shares authorized to repurchase under the stock repurchase program     5,000,000    
Stock repurchase program expiration date     Dec. 31, 2019    
Common Stock | Subsequent Event          
Class Of Stock [Line Items]          
Repurchase program, common stock purchased value at cost $ 0        
Series A Preferred Stock          
Class Of Stock [Line Items]          
Preferred stock, shares issued       839,200  
Preferred stock, shares outstanding       839,200  
Preferred stock, dividend rate percentage       9.75%  
Redeemable preferred stock value per share       $ 25.00  
Preferred stock, redemption terms       Commencing on December 20, 2018, the Company may redeem, at its option, the Series A Preferred Shares, in whole or in part, at a cash redemption price of $25.00 per share plus accrued and unpaid dividends (whether or not declared). Among other things, the Series A Preferred Shares have no stated maturity, are not subject to any sinking fund or other mandatory redemption, and are not convertible into or exchangeable for any of the Company’s other securities.  
Preferred stock, cash redemption price per share       $ 25.00  
Cash dividend per share to holders       $ 0.609375  
Cash dividend paid to holders       $ 511  
Series A Preferred Stock | Subsequent Event          
Class Of Stock [Line Items]          
Cash dividend per share to holders   $ 0.609375      
Cash dividend paid to holders   $ 511      
Series A Preferred Stock | Payment of dividend          
Class Of Stock [Line Items]          
Preferred stock, dividend payment terms       Dividends on the Series A Preferred Shares are cumulative from the date of original issue and are payable on January 31, April 30, July 31 and October 31, as and if declared by the Company’s board of directors. If the Company does not pay dividends in full on any two payment dates (whether consecutive or not), the per annum dividend rate will increase an additional 2.0% per annum per $25.00 stated liquidation preference, up to a maximum of 19.0% per annum.  
Series A Preferred Stock | Payment of dividend | Minimum          
Class Of Stock [Line Items]          
Preferred stock, dividend rate percentage       2.00%  
Series A Preferred Stock | Payment of dividend | Maximum          
Class Of Stock [Line Items]          
Preferred stock, dividend rate percentage       19.00%  
Series A Preferred Stock | NYSE American listing          
Class Of Stock [Line Items]          
Preferred stock, dividend rate percentage       2.00%  
Preferred stock, dividend payment terms       If the Company fails to maintain the listing of the Series A Preferred Shares on the NYSE American or other exchange for 30 days or more, the per annum dividend rate will increase by an additional 2.0% per annum so long as the listing failure continues.  
Series A Preferred Stock | Fixed Charge Coverage Ratio          
Class Of Stock [Line Items]          
Preferred stock, dividend payment terms       The Series A Preferred Shares require the Company to maintain a Fixed Charge Coverage Ratio of at least 2.0. If the Company is not in compliance with this ratio, then it cannot pay any dividend on its common stock.  
Series A Preferred Stock | Fixed Charge Coverage Ratio | Minimum          
Class Of Stock [Line Items]          
Preferred stock, fixed charge coverage ratio       2.00%