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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 01, 2019
Mar. 15, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Date of incorporation       Jan. 26, 2006      
Gross proceeds from issuance of common stock       $ 135,185      
issuance costs       $ 2,507 $ 50    
Stockholders' equity, reverse stock split   1-for-2.134686          
Preferred stock, shares outstanding     0 0      
Accumulated deficit     $ (135,409) $ (135,409)   $ (84,190) $ (85,187)
Revenue recorded included in deferred revenue       5,100      
ASU 2014-09 | Adjustments              
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Accumulated deficit     $ 2,100 $ 2,100   $ (997)  
Common Stock              
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Issuance of common stock upon conversion of convertible notes, shares     2,921,461        
Initial Public Offering ("IPO") | Series A and Series B Convertible Preferred Stock              
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Preferred stock, shares outstanding 0            
Initial Public Offering ("IPO") | Common Stock              
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Shares issued and sold 9,085,000            
Shares issued and sold, public offering price $ 16.00            
Gross proceeds from issuance of common stock $ 130,500            
Underwriting discount and commission 10,200            
issuance costs $ 4,600            
Initial Public Offering ("IPO") | Common Stock | Convertible Notes Payable (2019 Notes)              
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Issuance of common stock upon conversion of convertible notes, shares 2,921,461            
Initial Public Offering ("IPO") | Common Stock | Series A and Series B Convertible Preferred Stock              
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Issuance of common stock upon conversion of convertible notes, shares 22,301,190            
Precision PlantSciences, Inc.              
Description Of Business And Summary Of Significant Accounting Policies [Line Items]              
Date of incorporation       Jan. 04, 2012      
Percentage owned in subsidiary     100.00% 100.00%