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Stock-Based Compensation - Summary of Option and RSU Activity (Detail) - Equity Incentive Plan 2010 - $ / shares
shares in Thousands
 3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Shares Available for Grant    
Balance at the beginning of the year (in shares) 744 4,007
Options granted (in shares)   (1,297)
Options cancelled and returned to Plan (in shares) (5) 1
Balance at the end of the period (in shares) 629 744
Number of shares    
Balance at the beginning of the year (in shares) 1,633 337
Options granted (in shares)   1,297
Options cancelled and returned to Plan (in shares) 5 (1)
Balance at the end of the period (in shares) 1,628 1,633
Weighted Average Exercise Prices    
Weighted-average exercise price (in dollars per share) $ 1,020 $ 4,190
Options granted (in dollars per share)   200
Options cancelled and returned to Plan (in dollars per share) 7,200 7,200
Weighted-average exercise price (in dollars per share) $ 1,000 $ 1,020
RSU's    
Shares Available for Grant    
RSUs granted (in shares) (120) (2,028)
RSUs cancelled and returned to Plan (in shares)   11
Options    
Shares Available for Grant    
Additional shares authorized under the Plan   50