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Stock-Based Compensation - Summary of Stock Option Activity for Amended 2014 Plan and Related Information (Detail)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Number of shares  
Outstanding beginning balance (in shares) 1,635,790
Granted (in shares) 698,000
Exercised (in shares) 0
Canceled/forfeited (in shares) (316,832)
Expired (in shares) (70)
Outstanding ending balance (in shares) 2,016,888
Exercisable (in shares) 427,702
Weighted-Average Exercise Price  
Outstanding beginning balance (in usd per share) | $ / shares $ 11.08
Granted (in usd per share) | $ / shares 0.79
Exercised (in usd per share) | $ / shares 0.00
Canceled/forfeited (in usd per share) | $ / shares 24.55
Expired (in usd per share) | $ / shares 59.48
Outstanding ending balance (in usd per share) | $ / shares 5.40
Exercisable (in usd per share) | $ / shares $ 21.83
2015 Stock Incentive Plan | Employee Stock Option  
Number of shares  
Outstanding ending balance (in shares) 10,149
Private Dare | 2015 Stock Incentive Plan | Employee Stock Option  
Number of shares  
Outstanding beginning balance (in shares) 10,149