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Statements of Changes in Convertible Preferred Stock and Stockholders' Deficit (Parenthetical) - USD ($)
$ in Thousands
 11 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Convertible preferred stock liability $ 2,600    
Common Stock, issuance costs   $ 7,414  
Series A convertible preferred stock      
Convertible preferred stock, issuance costs 139   $ 20
Convertible preferred stock liability $ 2,600    
Series B convertible preferred stock      
Convertible preferred stock, issuance costs     $ 161