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Redeemable Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
vote
$ / shares
shares
Feb. 28, 2018
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Mar. 31, 2017
$ / shares
shares
Temporary Equity [Line Items]        
Shares Authorized (in shares) 12,104,749   12,104,749  
Shares Issued (in shares) 11,871,578   11,871,578  
Shares Outstanding (in shares) 11,871,578   11,871,578  
Carrying Value | $ $ 118,548   $ 118,548  
Liquidation Value | $ $ 119,194   $ 119,194  
Shareholder approval, minimum shares outstanding (in shares) 277,778      
Minimum public offering for conversion | $ $ 50,000      
Minimum public offering per share for conversion | $ / shares $ 30.0996      
Series 1 Preferred Stock        
Temporary Equity [Line Items]        
Shares Authorized (in shares) 245,096   245,096  
Shares Issued (in shares) 245,096   245,096  
Shares Outstanding (in shares) 245,096   245,096  
Carrying Value | $ $ 154   $ 154  
Liquidation Value | $ $ 154   $ 154  
Preferred stock votes per share | vote 0.352941      
Dividend rate (in dollars per share) | $ / shares $ 0.050112      
Liquidation preference per share (in dollars per share) | $ / shares $ 0.6264      
Series 2 Preferred Stock        
Temporary Equity [Line Items]        
Shares Authorized (in shares) 709,617   709,617  
Shares Issued (in shares) 709,608   709,608  
Shares Outstanding (in shares) 709,608   709,608  
Carrying Value | $ $ 1,489   $ 1,489  
Liquidation Value | $ $ 1,520   $ 1,520  
Preferred stock votes per share | vote 0.352941      
Dividend rate (in dollars per share) | $ / shares $ 0.171360      
Liquidation preference per share (in dollars per share) | $ / shares $ 2.142      
Series 3 Preferred Stock        
Temporary Equity [Line Items]        
Shares Authorized (in shares) 498,958   498,958  
Shares Issued (in shares) 498,938   498,938  
Shares Outstanding (in shares) 498,938   498,938  
Carrying Value | $ $ 2,862   $ 2,862  
Liquidation Value | $ $ 2,874   $ 2,874  
Preferred stock votes per share | vote 0.352941      
Dividend rate (in dollars per share) | $ / shares $ 0.4608      
Liquidation preference per share (in dollars per share) | $ / shares $ 5.76      
Series 4 Preferred Stock        
Temporary Equity [Line Items]        
Shares Authorized (in shares) 2,509,047   2,509,047  
Shares Issued (in shares) 2,509,032   2,509,032  
Shares Outstanding (in shares) 2,509,032   2,509,032  
Carrying Value | $ $ 15,656   $ 15,656  
Liquidation Value | $ $ 15,807   $ 15,807  
Preferred stock votes per share | vote 1      
Dividend rate (in dollars per share) | $ / shares $ 0.504      
Liquidation preference per share (in dollars per share) | $ / shares 6.30      
Liquidation participation cap per share (in dollars per share) | $ / shares $ 12.60      
Series 5 Preferred Stock        
Temporary Equity [Line Items]        
Shares Authorized (in shares) 2,086,138   2,086,138  
Shares Issued (in shares) 2,009,226   2,009,226  
Shares Outstanding (in shares) 2,009,226   2,009,226  
Carrying Value | $ $ 18,127   $ 18,127  
Liquidation Value | $ $ 18,275   $ 18,275  
Preferred stock votes per share | vote 1      
Dividend rate (in dollars per share) | $ / shares $ 0.72774      
Liquidation preference per share (in dollars per share) | $ / shares 9.0954      
Liquidation participation cap per share (in dollars per share) | $ / shares $ 18.1908      
Series 6 Preferred Stock        
Temporary Equity [Line Items]        
Shares Authorized (in shares) 3,389,227   3,389,227  
Shares Issued (in shares) 3,319,274   3,319,274  
Shares Outstanding (in shares) 3,319,274   3,319,274  
Carrying Value | $ $ 54,508   $ 54,508  
Liquidation Value | $ $ 54,674   $ 54,674  
Preferred stock votes per share | vote 1      
Dividend rate (in dollars per share) | $ / shares $ 1.317744      
Liquidation preference per share (in dollars per share) | $ / shares 16.4718      
Liquidation participation cap per share (in dollars per share) | $ / shares $ 32.9436      
Conversion price (in dollars per share) | $ / shares   $ 15.714   $ 15.5574
Conversion ratio (in shares)   1.05   1.06
Series 7 Preferred Stock        
Temporary Equity [Line Items]        
Shares Authorized (in shares) 2,666,666   2,666,666  
Shares Issued (in shares) 2,580,404   2,580,404  
Shares Outstanding (in shares) 2,580,404   2,580,404  
Carrying Value | $ $ 25,752   $ 25,752  
Liquidation Value | $ $ 25,890   $ 25,890  
Preferred stock votes per share | vote 1      
Dividend rate (in dollars per share) | $ / shares $ 0.802656      
Liquidation preference per share (in dollars per share) | $ / shares $ 10.0332