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Equity - Summary of Restricted Stock Units Awarded (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 210,310 28,768 24,493
Value of restricted stock units issued $ 1,421 $ 333 $ 211
January 1, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 5,000    
Closing price on date of grant $ 5.68    
Value of restricted stock units issued $ 29    
January 1, 2019 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 2,500    
Vesting Date Jan. 01, 2019    
January 1, 2019 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 2,500    
Vesting Date Jan. 01, 2020    
March 13, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 24,000    
Closing price on date of grant $ 7.36    
Value of restricted stock units issued $ 177    
March 13, 2019 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 7,920    
Vesting Date Mar. 13, 2019    
March 13, 2019 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 7,920    
Vesting Date Mar. 13, 2020    
March 13, 2019 [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 8,160    
Vesting Date Mar. 13, 2021    
March 13, 2019 Grants Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 30,000    
Closing price on date of grant $ 7.36    
Value of restricted stock units issued $ 221    
March 13, 2019 Grants Two [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 9,900    
Vesting Date Mar. 13, 2020    
March 13, 2019 Grants Two [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 9,900    
Vesting Date Mar. 13, 2021    
March 13, 2019 Grants Two [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 10,200    
Vesting Date Mar. 13, 2022    
March 13, 2019 Grants Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 78,310    
Closing price on date of grant $ 7.36    
Value of restricted stock units issued $ 576    
March 13, 2019 Grants Three [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 25,842    
Vesting Date Mar. 13, 2020    
March 13, 2019 Grants Three [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 25,842    
Vesting Date Mar. 13, 2021    
March 13, 2019 Grants Three [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 26,626    
Vesting Date Mar. 13, 2022    
September 1, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 50,000    
Closing price on date of grant $ 5.62    
Value of restricted stock units issued $ 281    
September 1, 2019 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 16,500    
Vesting Date Sep. 01, 2020    
September 1, 2019 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 16,500    
Vesting Date Sep. 01, 2021    
September 1, 2019 [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 17,000    
Vesting Date Sep. 01, 2022    
May 15, 2018 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   1,695  
Closing price on date of grant   $ 11.30  
Value of restricted stock units issued   $ 19  
May 15, 2018 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   560  
Vesting Date   May 15, 2019  
May 15, 2018 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   560  
Vesting Date   May 15, 2020  
May 15, 2018 [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   575  
Vesting Date   May 15, 2021  
December 31, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 23,000    
Closing price on date of grant $ 5.95    
Value of restricted stock units issued $ 137    
December 31, 2019 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 7,590    
Vesting Date Dec. 31, 2020    
December 31, 2019 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 7,590    
Vesting Date Dec. 31, 2021    
December 31, 2019 [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units 7,820    
Vesting Date Dec. 31, 2022    
May 31, 2018 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   20,000  
Closing price on date of grant   $ 11.64  
Value of restricted stock units issued   $ 233  
May 31, 2018 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   6,600  
Vesting Date   May 31, 2018  
May 31, 2018 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   6,600  
Vesting Date   May 31, 2019  
May 31, 2018 [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   6,800  
Vesting Date   May 31, 2020  
June 1, 2017 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units     4,493
Closing price on date of grant     $ 7.01
Value of restricted stock units issued     $ 31
Vesting Date     Jun. 01, 2017
May 31, 2018 Grants Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   5,000  
Closing price on date of grant   $ 11.64  
Value of restricted stock units issued   $ 58  
Vesting Date   May 31, 2018  
October 9, 2017 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units     20,000
Closing price on date of grant     $ 9.00
Value of restricted stock units issued     $ 180
October 9, 2017 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units     6,600
Vesting Date     Oct. 16, 2017
October 9, 2017 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units     6,600
Vesting Date     Jan. 15, 2018
October 9, 2017 [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units     6,800
Vesting Date     Oct. 15, 2018
May 31, 2018 Grants Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   1,073  
Closing price on date of grant   $ 11.64  
Value of restricted stock units issued   $ 12  
Vesting Date   May 31, 2018  
August 20, 2018 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   1,000  
Closing price on date of grant   $ 11.46  
Value of restricted stock units issued   $ 11  
August 20, 2018 [Member] | Vesting Date 1 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   333  
Vesting Date   Aug. 20, 2019  
August 20, 2018 [Member] | Vesting Date 2 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   333  
Vesting Date   Aug. 20, 2020  
August 20, 2018 [Member] | Vesting Date 3 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock units   334  
Vesting Date   Aug. 20, 2021