Debt and Letters of Credit (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Scedule of contractual future payments under the credit and security agreement

Contractual future payments under the Credit and Security Agreement are as follows:

	Line of Credit		Term Loan		Total
2018	$	—	$	14,063	$	14,063
2019	—		—		—
2020	23,475		—		23,475
Total	$	23,475	$	14,063	$	37,538