Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments Required Under Operating Leases

Future minimum rental cash payments required under the Company's operating leases as of December 31, 2017 are as follows (in thousands):

Year Ending on December 31:
2018	$	1,521
2019	1,421
2020	477
2021	498
2022	—
	$	3,917