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Stock-Based Compensation - Summary of Options and Awards Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Stock-based compensation    
Options and Awards Available for Grant, Outstanding, Beginning balance 764,145  
Options and Awards Available for Grant, Options authorized 512,864  
Options and Awards Available for Grant, RSUs granted (92,000)  
Options Available for Grant, RSUs cancelled/forfeited 7,250  
Options and Awards Available for Grant, Options granted (417,000)  
Options Available for Grant, Options exercised 0  
Options and Awards Available for Grant, Options cancelled/forfeited 92,250.00  
Options and Awards Available for Grant, Outstanding, Ending balance 867,509 764,145
Number of Options, Outstanding, Beginning balance 1,475,299  
Number of Options, Options granted 417,000  
Number of Options, Options exercised (2,705)  
Number of Options, Options cancelled/forfeited (93,491)  
Number of Options, Outstanding, Ending balance 1,796,103 1,475,299
Number of Options, exercisable 727,511  
Weighted - Average Exercise Price Per Share, Options outstanding, Beginning balance $ 7.60  
Weighted - Average Exercise Price Per Share, Options granted 6.54  
Weighted - Average Exercise Price Per Share, Options exercised 4.83  
Weighted - Average Exercise Price Per Share, Options cancelled/forfeited 9.04  
Weighted - Average Exercise Price Per Share, Options outstanding, Ending balance 7.28 $ 7.60
Weighted - Average Exercise Price Per Share, Options exercisable $ 6.82  
Weighted - Average Remaining Contractual Life, Options outstanding 8 years 2 months 12 days 7 years 9 months 18 days
Weighted - Average Remaining Contractual Life, Options exercisable 7 years 1 month 6 days  
Aggregate Intrinsic Value, Options outstanding $ 1,468 $ 284
Aggregate Intrinsic Value, Options exercised 80  
Aggregate Intrinsic Value, Options exercisable $ 901