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Stock-Based Compensation - Summary of Option and RSU Activity under Equity Incentive Plan and Amended and Restated 2010 Equity Incentive Plan (Detail) - Equity Incentive Plan 2010 - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Shares Available for Grant        
Balance at the beginning of the year (in shares) 32,000 37,000 200,000 200,000
Options granted (in shares)     (65,000)  
Options cancelled and returned to Plan (in shares)   1,000    
Plan termination (in shares) (32,000)      
Balance at the end of the period (in shares)   32,000 37,000  
Number of shares        
Balance at the beginning of the year (in shares) 81,000 82,000 17,000 17,000
Options granted (in shares)     65,000  
Balance at the end of the period (in shares) 81,000 81,000 82,000 81,000
Options cancelled and returned to Plan (in shares)   (1,000)    
Weighted Average Exercise Prices        
Weighted-average exercise price (in dollars per share) $ 20.00 $ 20.40 $ 83.80 $ 83.80
Options granted (in dollars per share)     4.00  
Options cancelled and returned to Plan (in dollars per share)   144.00    
Weighted-average exercise price (in dollars per share) $ 20.00 $ 20.00 $ 20.40 $ 20.00
Options        
Shares Available for Grant        
Additional shares authorized under the Plan     2,000  
RSUs granted (in shares)       0
RSU's        
Shares Available for Grant        
RSUs granted (in shares)   (6,000) (101,000)  
RSUs cancelled and returned to Plan (in shares)     1,000  
Number of shares        
RSUs cancelled and returned to Plan (in shares)     1,000  
Weighted Average Exercise Prices        
RSUs granted (in dollars per share)   $ 4.60 $ 4.00  
RSUs cancelled and returned to Plan (in dollars per shares)     $ 25.20