Summary of Significant Accounting Policies - Operating and Financing Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases
Operating lease right-of-use assets, net of amortization	$ 6,312
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	pmts:PropertyPlantAndEquipmentOperatingLeaseRightOfUseAsse
Operating lease liability (current)	$ 2,283
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current
Long-term operating liability	$ 5,067
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Total operating lease liabilities	$ 7,350
Property, equipment and leasehold improvements	80,577	$ 92,856
Accumulated depreciation	(44,801)	(53,746)
Total financing leases in property, equipment and leasehold improvements, net	42,088	$ 39,110
Financing lease liability (current)	$ 2,211
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current
Long-term financing liability	$ 3,886
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Total financing lease liabilities	$ 6,097
Financing leases
Leases
Property, equipment and leasehold improvements	8,256
Accumulated depreciation	(1,094)
Total financing leases in property, equipment and leasehold improvements, net	$ 7,162
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	pmts:PropertyPlantAndEquipmentOperatingLeaseRightOfUseAsse