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Fair Value Measurements - Recurring (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Transfer between levels        
Transfer of assets from level 1 to 2     $ 0  
Transfer of assets from level 2 to 1     0  
Transfer of liabilities from level 1 to 2     0  
Transfer of liabilities from level 2 to 1     0  
Assets        
Marketable securities     148,235 $ 90,281
Issuances, changes in fair value, exercise and reclassification of the Level 3 financial instrument        
Balance as of the beginning of the period $ 2,300 $ 2,600    
Change in fair value of convertible preferred stock liability through date   (300)    
Change in fair value of convertible preferred stock liability through date of Series A second tranche issuance 17,900      
Recognition of fair value upon issuance of second tranche Series A convertible preferred stock $ (20,200)      
Balance as of the end of the period   $ 2,300    
Recurring        
Assets        
Cash equivalents     2,658 3,245
Marketable securities     148,235 90,281
Total Assets     150,893 93,526
Recurring | Level 1        
Assets        
Cash equivalents     2,658 3,245
Marketable securities     148,235 90,281
Total Assets     $ 150,893 $ 93,526