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Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Temporary Equity [Line Items]          
Shares Authorized (in shares) 24,069,615 24,069,615   24,069,615  
Shares Issued (in shares) 21,238,105 21,233,190   21,233,190  
Shares Outstanding (in shares) 21,238,105 21,233,190 21,233,190 21,233,190 14,350,216
Preferential Liquidation Value (in thousands) $ 121,174,000 $ 121,144,000   $ 121,144,000  
Carrying Value (in thousands) $ 105,265,000 $ 105,235,000 $ 105,235,000 $ 105,235,000 $ 63,417,000
Series A          
Temporary Equity [Line Items]          
Shares Authorized (in shares) 1,629,629 1,629,629   1,629,629  
Shares Issued (in shares) 1,629,626 1,629,626   1,629,626  
Shares Outstanding (in shares) 1,629,626 1,629,626   1,629,626  
Per share Preference (in USD per share) $ 2.70 $ 2.70   $ 2.70  
Preferential Liquidation Value (in thousands) $ 4,400,000 $ 4,400,000   $ 4,400,000  
Carrying Value (in thousands) $ 4,369,000 $ 4,369,000   $ 4,369,000  
Series A-1          
Temporary Equity [Line Items]          
Shares Authorized (in shares) 1,111,111 1,111,111   1,111,111  
Shares Issued (in shares) 1,111,109 1,111,109   1,111,109  
Shares Outstanding (in shares) 1,111,109 1,111,109   1,111,109  
Per share Preference (in USD per share) $ 3.38 $ 3.38   $ 3.38  
Preferential Liquidation Value (in thousands) $ 3,755,000 $ 3,755,000   $ 3,755,000  
Carrying Value (in thousands) $ 3,723,000 $ 3,723,000   $ 3,723,000  
Series B          
Temporary Equity [Line Items]          
Shares Authorized (in shares) 6,264,470 6,264,470   6,264,470  
Shares Issued (in shares) 6,264,463 6,264,463   6,264,463  
Shares Outstanding (in shares) 6,264,463 6,264,463   6,264,463  
Per share Preference (in USD per share) $ 6.11 $ 6.11   $ 6.11  
Preferential Liquidation Value (in thousands) $ 38,276,000 $ 38,276,000   $ 38,276,000  
Carrying Value (in thousands) $ 38,014,000 $ 38,014,000   $ 38,014,000  
Series C          
Temporary Equity [Line Items]          
Shares Authorized (in shares) 15,064,405 15,064,405   15,064,405  
Shares Issued (in shares) 12,232,907 12,227,992   12,227,992  
Shares Outstanding (in shares) 12,232,907 12,227,992   12,227,992  
Per share Preference (in USD per share) $ 6.11 $ 6.11   $ 6.11  
Preferential Liquidation Value (in thousands) $ 74,743,000 $ 74,713,000   $ 74,713,000  
Carrying Value (in thousands) $ 59,159,000 $ 59,129,000   $ 59,129,000