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Stock-Based Compensation - Summary of Option and RSU Activity (Detail) - Equity Incentive Plan 2010 - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares Available for Grant      
Balance at the beginning of the year (in shares) 200,000 12,000 7,000
Options granted (in shares) (145,000) (2,000) (8,000)
Options cancelled and returned to Plan (in shares) 1,000   19,000
Plan termination (in shares) (32,000)    
Balance at the end of the period (in shares) 88,000 200,000 12,000
Number of Shares      
Balance at the beginning of the year (in shares) 17,000 15,000 26,000
Options granted (in shares) 145,000 2,000 8,000
Options cancelled and returned to Plan (in shares) (1,000)   (19,000)
Balance at the end of the period (in shares) 161,000 17,000 15,000
Weighted Average Exercise Prices      
Weighted-average exercise price (in dollars per share) $ 83.84 $ 96.24 $ 277.62
Options granted (in dollars per share) 2.64 25.60 15.15
Options cancelled and returned to Plan (in dollars per share) 144.00   313.80
Weighted-average exercise price (in dollars per share) $ 10.85 $ 83.84 $ 96.24
Options      
Shares Available for Grant      
Additional shares authorized under the Plan 183,000 202,000 12,000
RSU's      
Shares Available for Grant      
RSUs granted (in shares) (120,000) (13,000) (21,000)
RSUs cancelled and returned to Plan (in shares) 1,000 1,000 3,000
Number of Shares      
RSUs cancelled and returned to Plan (in shares) 1,000 1,000 3,000
Weighted Average Exercise Prices      
RSUs granted (in dollars per share) $ 3.79 $ 17.26 $ 18.60
RSUs cancelled and returned to Plan (in dollars per shares) $ 25.13 $ 24.14 $ 100.78