Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued salaries, bonus, and benefits	$ 1,182,958	$ 1,491,844
Accrued licenses and maintenance fees	483,879	576,598
Accrued warranties	136,946	149,464	$ 164,365
Accrued taxes	188,074	251,988
Accrued professional services	765,948	430,088
Other	329,523	383,960
Total accrued liabilities	3,087,328	3,283,942
Less: Long term accrued liabilities	(813,641)	(641,461)
Total current accrued liabilities	$ 2,273,687	$ 2,642,481