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Stock Incentive Plans - Stock Option Plan Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Stock options      
Outstanding at beginning of year (in shares) 2,845,626    
Granted (in shares) 930,000    
Outstanding at end of year (in shares) 3,775,626   2,845,626
Vested and Exercisable to vest at end of year (in shares) 1,573,375    
Weighted-Average Exercise Price      
Outstanding at beginning of year (in dollars per share) $ 4.53    
Granted (in dollars per share) 1.28    
Outstanding at end of year (in dollars per share) 3.73   $ 4.53
Vested and Exercisable at end of year (in dollars per share) $ 5.30    
Weighted Average Remaining Contractual Term (years)      
Outstanding at end of year 8 years 29 days   7 years 9 months
Vested and Exercisable at end of year 6 years 8 months 19 days    
Aggregate Intrinsic Value      
Outstanding at the beginning of the year $ 216    
Outstanding at the end of the year 1,001   $ 216
Aggregate intrinsic value of options vested and exercisable 140    
Stock options      
Unrecognized stock-based compensation expense      
Intrinsic value of options exercised 0 $ 27  
Adjusted fair value of options vested $ 600 $ 600  
Weighted average grant date fair value of options granted (in dollars per share) $ 0.88 $ 0.84  
Unrecognized compensation expense related to unvested stock option awards $ 3,600    
Weighted-average amortization period over which cost is expected to be recognized 2 years 1 month 6 days