Long-Term Debt - Schedule of Future Minimum Principal and Interest Payments Under Term Loans (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Debt Disclosure [Abstract]
2019	$ 458
2020	1,843
2021	6,609
2022	9,533
2023	8,920
2024	5,599
Total principal and interest payments	32,962
Less interest and final payment fee	(7,962)
Long-term debt	$ 25,000