Leases - Narrative (Details) $ in Thousands		12 Months Ended
	Sep. 28, 2016 USD ($) renewal_option	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Variable lease expenses		$ 963
Amortization of operating lease right-of-use assets		$ 1,186	$ 0
Office and Laboratory Space
Property, Plant and Equipment [Line Items]
Number lease renewal options | renewal_option	1
Term of lease contract	5 years
Operating lease discount rate	10.00%
Expected remaining lease term	5 years 8 months 12 days	4 years 8 months 12 days
Variable lease expenses		$ 1,000
Amortization of operating lease right-of-use assets		$ 1,200
Office and Laboratory Space | Restricted Cash Noncurrent
Property, Plant and Equipment [Line Items]
Letters of credit issued to the landlord in connection with lease agreement	$ 500