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Warrants - Additional Information (Detail) - Warrant [Member]
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Class of Warrant or Right [Line Items]  
Number of warrants outstanding | shares 3,284,440
Weighted-average exercise price of warrants | $ / shares $ 7.79
Weighted-average remaining contractual term of warrants 3 years 2 months 12 days