Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Accounts Receivable and Current and Long-Term Contract Assets and Liabilities

The Company’s Accounts receivable and current and long-term contract assets and liabilities are summarized in the following table.

	Accounts Receivable, Less Allowance		Contract Assets (Current)		Contract Assets (Long-Term)		Contract Liabilities (Current)		Contract Liabilities (Long-Term)
Balance at January 1, 2018	$	2,104,555	$	33,031	$	135,150	$	208,909	$	8,745
Balance at December 31, 2018	2,018,768		56,598		213,954		272,857		8,745