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Significant Accounting Policies - Summary of Computation of Net Income or Loss Per Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income (loss) $ 1,274,559 $ 437,259 $ (3,190,347) $ (1,105,791) $ 591,933 $ 234,353 $ (70,121) $ 385,090 $ (2,584,320) $ 1,141,255 $ 3,733,707
Accretion of dividends on preferred stock                     (1,537,021)
Net income (loss) attributable to common stockholders                 (2,584,320) 1,141,255 2,196,686
Accretion of dividends on preferred stock                     125,205
Adjustment for change in fair value of warrant liability                     (460,289)
Net income (loss) attributable to common stockholders - diluted                 $ (2,584,320) $ 1,141,255 $ 1,861,602
Weighted average shares used in calculating income (loss) per share                      
Basic                 9,520,947 9,485,271 3,373,316
Diluted                 9,520,947 10,361,373 4,667,503
Net income (loss) per share:                      
Basic $ 0.13 $ 0.05 $ (0.34) $ (0.12) $ 0.06 $ 0.02 $ (0.01) $ 0.04 $ (0.27) $ 0.12 $ 0.65
Diluted $ 0.13 $ 0.04 $ (0.34) $ (0.12) $ 0.06 $ 0.02 $ (0.01) $ 0.04 $ (0.27) $ 0.11 $ 0.40