Commitments and Contingencies - Schedule of Future Aggregate Minimum Lease Payments Calculated under ASC 840 (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating Lease, 2019	$ 3,133
Operating Lease, 2020	3,330
Operating Lease, 2021	3,413
Operating Lease, 2022	3,497
Operating Lease, 2023	3,378
Operating Lease, Thereafter	1,744
Operating Lease, Total lease payments	18,495
Less: Operating Lease, current portion	(3,133)
Operating Lease, Long-term lease liabilities	15,362
Financing Lease, 2019	33
Financing Lease, 2020	34
Financing Lease, 2021	35
Financing Lease, 2022	9
Total financing lease payments	111
Less: Financing Lease, amount representing interest	(33)
Financing Lease Value of lease liabilities under ASC 840	78
Less: Financing Lease, current portion	(17)
Financing Lease, Long-term lease liabilities	61
Remaining Lease Payments, 2019	3,166
Remaining Lease Payments, 2020	3,364
Remaining Lease Payments, 2021	3,448
Remaining Lease Payments, 2022	3,506
Remaining Lease Payments, 2023	3,378
Remaining Lease Payments, Thereafter	1,744
Total lease payments	18,606
Less: amount representing interest	(33)
Value of lease liabilities under ASC 840	18,573
Less: current portion	(3,150)
Long-term lease liabilities	$ 15,423

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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