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Stock-Based Compensation - Additional Information (Detail)
1 Months Ended 12 Months Ended
May 31, 2015
shares
Jun. 30, 2010
USD ($)
Period
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
New Employees            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Outstanding awards     0 0    
Options            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unamortized compensation cost, net of expected forfeitures | $     $ 200,000      
Weighted average expected period over which the expense is to be recognized     2 years 2 months 12 days      
Fair value of vested options and awards | $     $ 300,000      
Tax benefits associated with exercise of stock options | $     $ 0 $ 0 $ 0  
Dividend yield (as a percent)     0.00% 0.00% 0.00%  
Stock options exercised     0 0 0  
Employee Stock Purchase Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares reserved for issuance   200,000        
Increase in number of shares reserved for issuance 200,000          
Number of offering periods | Period   2        
Offering period   6 months        
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less   85.00%        
Shares authorized and unissued     7,500      
Employee Stock Purchase Plan | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Maximum amount of shares that eligible employee may purchase annually (in dollars) | $   $ 25,000        
RSU's            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unamortized compensation cost, net of expected forfeitures | $     $ 300,000      
Weighted average expected period over which the expense is to be recognized     2 years 1 month 6 days      
Equity Incentive Plan 2010            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Options granted (in shares)     0      
Outstanding awards     172,000      
Weighted-average exercise price | $ / shares     $ 20.00      
Shares authorized and unissued     88,000 200,000 12,000 7,000
Equity Incentive Plan 2010 | Options            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Increase in number of shares reserved for issuance     183,000 202,000 12,000  
Equity Incentive Plan 2010 | RSU's            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Weighted-average exercise price | $ / shares     $ 3.75 $ 24.31 $ 31.59 $ 162.55
Total intrinsic value of the restricted stock units outstanding | $     $ 200,000      
Stock Incentive Plan 2019            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares reserved for issuance     182,500      
Stock Incentive Plan 2019 | Options            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Maximum annual option grants or other awards to the entity's non-employee directors (in shares)     2,000      
Maximum one-time grant of an option or other awards to the entity's non employee directors (in shares) | $     $ 6,000      
Minimum percentage of voting rights required for applicability of a specific expiration term     10.00%      
Maximum expiration term of options granted     5 years      
Term of plan     10 years      
Stock Incentive Plan 2019 | Options | Minimum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting period of replacement options     3 years      
Stock Incentive Plan 2019 | Options | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting period of replacement options     4 years