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Basic and Diluted Net Loss Per Common Share - Summary of Computation of Basic and Diluted Net Loss Available to Stockholders (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Basic net loss per share:    
Basic net loss per share $ (0.54) $ (0.46)
Diluted net loss per share:    
Diluted net loss per share $ (0.54) $ (0.46)
Class A common stock    
Basic net loss per share:    
Allocation of undistributed losses $ (2,272) $ (1,938)
Number of shares used in per share computation (as converted) 4,242 4,200
Basic net loss per share $ (0.54) $ (0.46)
Diluted net loss per share:    
Allocation of undistributed losses $ (2,272) $ (1,938)
Number of shares used in per share computation (as converted) 4,242 4,200
Diluted net loss per share $ (0.54) $ (0.46)
Common stock equivalents excluded from calculation of diluted net loss per share as the effect would have been anti-dilutive: 445 418
Class B common stock    
Basic net loss per share:    
Allocation of undistributed losses $ (1,253) $ (1,080)
Number of shares used in per share computation (as converted) 2,340 2,340
Basic net loss per share $ (0.54) $ (0.46)
Diluted net loss per share:    
Allocation of undistributed losses $ (1,253) $ (1,080)
Number of shares used in per share computation (as converted) 2,340 2,340
Diluted net loss per share $ (0.54) $ (0.46)
Series C convertible preferred stock    
Basic net loss per share:    
Allocation of undistributed losses $ (407) $ (351)
Number of shares used in per share computation (as converted) 760 760
Basic net loss per share $ (0.54) $ (0.46)
Diluted net loss per share:    
Allocation of undistributed losses $ (407) $ (351)
Number of shares used in per share computation (as converted) 760 760
Diluted net loss per share $ (0.54) $ (0.46)