Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Details)

v3.10.0.1
Fair Value Measurements - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Loss on remeasurement of convertible preferred stock warrant liability     $ 3,725,000 $ 524,000
Reclassification of convertible preferred stock warrant liability into additional paid-in capital $ 5,700,000   $ 5,711,000  
Transfers into or out of level 3   $ 0    
Other Expense, Net        
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Loss on remeasurement of convertible preferred stock warrant liability   $ 3,700,000