Series A Redeemable Convertible Preferred Stock - Reconciliation of Net Loss Attributable to Common Stockholders (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Net income (loss)	$ (1,171,723)	$ (124,907)	$ (1,004,104)	$ 506,877	$ (1,296,630)	$ (497,227)
Less: Accrual of Series A redeemable convertible preferred stock dividends	256,553	247,027	214,963	243,167	503,580	458,130
Less: Deemed dividend on Series A redeemable convertible preferred stock	0		0		0	2,269,042
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	134,223	$ 129,239	77,645	$ 38,105	263,462	115,750
Net loss attributable to common stockholders	$ (1,562,499)		$ (1,296,712)		$ (2,063,672)	$ (3,340,149)