Summary of Significant Accounting Policies (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2019

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the statements of cash flows:

	June 30, 2019		December 31, 2018		June 30, 2018		December 31, 2017
Cash and cash equivalents	$	3,055,894	$	4,572,487	$	7,428,993	$	1,847,171
Restricted cash		185,380		164,720		181,490		243,380
Total cash, cash equivalents and restricted cash in the condensed consolidated statement of cash flows	$	3,241,274	$	4,737,207	$	7,610,483	$	2,090,551

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the statements of cash flows:

	December 31, 2018		December 31, 2017		December 31, 2016
Cash and cash equivalents	$	4,572,487	$	1,847,171	$	4,117,324
Restricted cash		164,720		243,380		243,380
Total cash, cash equivalents and restricted cash in the consolidated statements of cash flows	$	4,737,207	$	2,090,551	$	4,360,704

Schedule of Inventories

Inventories are valued using the first-in, first-out method and stated at the lower of cost or net realizable value and consist of the following: 

	June 30, 2019		December 31, 2018
Raw materials and supplies	$	237,500	$	368,438
Work-in-process		135,916		58,402
Finished goods		194,006		116,907
Total	$	567,422	$	543,747

Inventories are valued using the first-in, first-out method and stated at the lower of cost or net realizable value and consist of the following:

	December 31,
	2018		2017
Raw materials and supplies	$	368,438	$	360,134
Work-in process		58,402		51,233
Finished goods		116,907		122,058
Total	$	543,747	$	533,425

Property, Plant and Equipment

Property and equipment consisted of the following at December 31, 2018 and 2017:

	December 31,
	2018			2017
Laboratory and manufacturing equipment	$	4,829,323		$	4,109,367
Office furniture and equipment		700,299			700,299
Computers and network equipment		1,520,713			1,505,651
Leasehold improvements		745,800			729,504
		7,796,135			7,044,821
Less accumulated depreciation		(6,574,308	)		(6,209,284	)
Property and equipment, net	$	1,221,827		$	835,537

Schedule of Finite-Lived Intangible Assets

Finite-lived intangible assets include trademarks, developed technology and customer relationships and consisted of the following as of June 30, 2019 and December 31, 2018

			June 30, 2019					December 31, 2018
	Cost		Accumulated Amortization			Net Balance		Accumulated Amortization			Net Balance
Trademarks and trade names	$	461,000	$	(182,835	)	$	278,165	$	(159,783	)	$	301,217
Developed technology		458,000		(259,458	)		198,542		(226,746	)		231,254
Customer relationships		1,094,000		(619,249	)		474,751		(541,105	)		552,895
	$	2,013,000	$	(1,061,542	)	$	951,458	$	(927,634	)	$	1,085,366

Finite-lived intangible assets include trademarks, developed technology and customer relationships, and consisted of the following as of December 31, 2018 and 2017:

			December 31, 2018					December 31, 2017
	Cost		Accumulated Amortization			Net Balance		Accumulated Amortization			Net Balance
Trademarks and tradenames	$	461,000	$	(159,783	)	$	301,217	$	(113,679	)	$	347,321
Developed technology		458,000		(226,746	)		231,254		(161,322	)		296,678
Customer relationships		1,094,000		(541,105	)		552,895		(384,817	)		709,183
	$	2,013,000	$	(927,634	)	$	1,085,366	$	(659,818	)	$	1,353,182

Schedule of Expected Amortization of Intangible Assets

Expected amortization of intangible assets for each of the next five fiscal years is as follows.

Year Ending December 31,
2019	$	267,816
2020		267,816
2021		267,816
2022		165,117
2023		46,104
Thereafter		70,697
Total	$	1,085,366