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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended
May 20, 2015
shares
May 14, 2015
Mar. 31, 2017
USD ($)
IncentivePlan
shares
Mar. 31, 2016
USD ($)
shares
Dec. 31, 2016
shares
Jun. 30, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity incentive plans | IncentivePlan     2        
Total number of options outstanding     4,380,299   4,578,782    
Unrecognized compensation cost related to unvested stock-based compensation grants | $     $ 1,600,000        
Weighted-average remaining recognition period     2 years 10 months 13 days        
Options granted     0 0      
Stock-based compensation | $     $ 371,000 $ 221,000      
Warrant, exercisable term     5 years        
Placement Agent [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock warrants, exercise price per share | $ / shares           $ 13.45  
Common stock warrants issued           33,445  
Series D Redeemable Convertible Preferred Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock warrants, exercise price per share | $ / shares           $ 18.16  
Common stock warrants issued           1,227,783  
Mahyco International [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of warrant to purchase common stock issued             75,666
Common stock warrants, exercise price per share | $ / shares             $ 16.52
2015 Employee Stock Purchase Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares reserved for issuance under plan     1,403,627        
Percentage in payroll deductions to acquire shares of common stock   15.00%          
Purchase plan offering period   6 months          
Employees are able to purchase company's common stock on first trading day of offering period, percentage   85.00%          
Issuance of common stock pursuant to employee stock purchase plan     96,373        
First offering period, start date   May 14, 2015          
First offering period, end date   Feb. 01, 2016          
Stock-based compensation | $     $ 4,000 $ 30,000      
2015 Omnibus Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Terms under the plan     The 2015 Plan became effective upon the IPO in May 2015 and all shares that were reserved, but not issued, under the 2006 Plan were assumed by the 2015 Plan. Upon effectiveness, the 2015 Plan had 3,087,729 shares of common stock reserved for future issuance, which included 212,729 shares under the 2006 Plan that were transferred to and assumed by the 2015 Plan. The 2015 Plan provides for automatic annual increases in shares available for grant, beginning on January 1, 2016. In addition, shares subject to awards under the 2006 Plan that are forfeited or canceled will be added to the 2015 Plan.        
Total number of shares reserved for issuance under plan 3,087,729   7,071,728        
Options vesting period 4 years            
Common stock available for future grant     5,458,292        
Total number of options outstanding     1,613,496        
2015 Omnibus Equity Incentive Plan [Member] | Share-based Compensation Award, Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options vesting percentage at end of one year 25.00%            
2006 Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares reserved for issuance under plan 212,729            
Total number of options outstanding     2,766,803        
Maximum [Member] | 2015 Omnibus Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options exercisable period 10 years