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Share-based Compensation - Summary of Stock Option Activities (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Number of Stock Options    
Number of Options, Options outstanding, beginning of period 629,629  
Number of Options, Granted 469,600  
Number of Options, Forfeited and cancelled (277,604)  
Number of Options, Options outstanding, end of period 821,625 629,629
Number of Options, Options exercisable, end of period 251,748  
Number of Options, Options vested and expected to vest 820,235  
Stock Options, Weighted Average Exercise Price    
Weighted Average Exercise Price, Options outstanding, beginning of period $ 6.30  
Weighted Average Exercise Price, Granted 2.54  
Weighted Average Exercise Price, Forfeited and cancelled 3.38  
Weighted Average Exercise Price, Options outstanding, end of period 5.14 $ 6.30
Weighted Average Exercise Price, Options exercisable, end of period 10.32  
Weighted Average Exercise Price, Options vested and expected to vest, end of period $ 5.14  
Stock Options, Weighted Average Remaining Contractual Term    
Weighted Average Remaining Contractual Term (in years), Options outstanding 8 years 10 months 25 days 8 years 10 months 10 days
Weighted Average Remaining Contractual Term (in years), Options exercisable 7 years 7 months 13 days  
Weighted Average Remaining Contractual Term (in years), Options vested and expected to vest 8 years 10 months 25 days