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Stock-Based Compensation - Summary of Stock Option Activity for Amended 2014 Plan and Related Information (Detail)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Number of shares  
Outstanding beginning balance (in shares) 1,635,790
Granted (in shares) 563,000
Exercised (in shares) 0
Canceled/forfeited (in shares) (8,360)
Expired (in shares) 70
Outstanding ending balance (in shares) 2,190,360
Exercisable (in shares) 650,151
Weighted-Average Exercise Price  
Outstanding beginning balance (in usd per share) | $ / shares $ 11.08
Granted (in usd per share) | $ / shares 0.76
Exercised (in usd per share) | $ / shares 0.00
Canceled/forfeited (in usd per share) | $ / shares 17.81
Expired (in usd per share) | $ / shares 59.48
Outstanding ending balance (in usd per share) | $ / shares 8.40
Exercisable (in usd per share) | $ / shares $ 25.97
2015 Stock Incentive Plan [Member] | Employee Stock Option [Member]  
Number of shares  
Outstanding ending balance (in shares) 10,149
Private Dare [Member] | 2015 Stock Incentive Plan [Member] | Employee Stock Option [Member]  
Number of shares  
Outstanding beginning balance (in shares) 10,149
Outstanding ending balance (in shares) 50,000