Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Long-term Debt, by Current and Noncurrent [Abstract]

Schedule of expected future principal payments for the credit facility

Expected future principal payments for the credit facility are as follows:

Year ending December 31:
2019	$	—
2020	10,208
2021	12,250
2022	2,042
Total expected future principal payments	$	24,500