Notes Payable and Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Summary of Principal Payments Due During Each of Next Five Years and Thereafter

Principal payments during each of the next five years and thereafter are due as follows:

	December 31, 2017
2018	$	—
2019		—
2020		—
2021		9,000
2022		12,000
2023 and thereafter		39,000
Total	$	60,000