Summary of Significant Accounting Policies - Summary of Potential Common Shares Issuable (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	5,856,642	5,714,268
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	33,126	40,001
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	27,883	26,876
Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	723,746	573,504
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	5,071,887	5,073,887