Commitments and Contingencies (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) lease
Lease Commitments
Number of operating leases | lease	2
Corporate headquarters
Lease Commitments
Irrevocable standby letter of credit provided to landlord	$ 785,000
Corporate headquarters | High end of range
Lease Commitments
Aggregate annual lease payments	2,500,000
Off-site back-up facility | High end of range
Lease Commitments
Aggregate annual lease payments	$ 32,000