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Stock-Based Compensation - Summary of Nonvested Shares (Details) - Restricted Stock Awards
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares, Beginning balance | shares 1,400
Granted, Shares | shares 4,000
Vested, Shares | shares (200)
Nonvested shares, Ending balance | shares 5,200
Nonvested, Weighted-Average Grant Date Fair Value, Beginning balance | $ / shares $ 6.25
Granted, Weighted-Average Grant Date Fair Value | $ / shares 15.35
Vested, Weighted-Average Grant Date Fair Value | $ / shares 6.25
Nonvested, Weighted-Average Grant Date Fair Value, Ending balance | $ / shares $ 12.32
Nonvested, Aggregate Intrinsic Value, Ending balance | $ $ 10,776