Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of financial assets measured at fair value on nonrecurring basis

	As of June 30, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Cash and money market accounts	$	1,296,016		—		—	$	1,296,016
Bank certificates of deposit		—	$	8,675,329		—	$	8,675,329
Liabilities:
Interest rate swaps		—	$	57,216		—	$	57,216

	As of December 31, 2018
	Level 1		Level 2		Level 3		Total
Assets:
Cash and money market accounts	$	2,521,050		—		—	$	2,521,050
Interest rate swaps		—	$	40,209		—	$	40,209

Schedule of sales to significant customers

	During the Three-Month Periods Ended June 30,						During the Six-Month Periods Ended June 30,
	2019			2018			2019			2018
Company A		46	%		44	%		44	%		40	%
Company B		23	%		20	%		26	%		22	%
Company C		10	%		11	%		*			11	%

* Amount is less than 10%

Schedule of accounts receivable due from significant customers

	As of June 30, 2019			As of December 31, 2018
Company A		48	%		35	%
Company B		28	%		36	%
Company C		12	%		15	%