Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued salaries, bonus, and benefits	$ 1,199,869	$ 1,491,844
Accrued licenses and maintenance fees	483,879	577,389
Accrued warranties	125,820	149,464	$ 164,365
Accrued taxes	184,442	192,268
Accrued professional services	175,000	489,017
Other	467,995	383,960
Total accrued liabilities	2,637,005	3,283,942
Less: Long term accrued liabilities	(260,947)	(641,461)
Total current accrued liabilities	$ 2,376,058	$ 2,642,481