Related Parties (Details) $ in Thousands		1 Months Ended			12 Months Ended
	Jun. 21, 2018 USD ($)	May 31, 2017 USD ($)	Apr. 30, 2017 USD ($) item	Jan. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Parties
Cash payments					$ 500
Accounts Receivable					$ 100
Amount due to related party							$ 0
Amount due from related party							0
Option to extend					false
Sublease income					$ 908
Maturity term from issuance date of the notes		7 years	7 years
Maturity date of termination		60 days	60 days
Interest rate (as a percent)			2.05%
January 2017 promissory note
Related Parties
Amount due to related party							0
Amount due from related party							0
Interest rate (as a percent)				1.97%
May 2017 promissory note
Related Parties
Amount due to related party							0
Amount due from related party							0
Interest rate (as a percent)		2.04%
Flagship | Services Agreement
Related Parties
Payment of general and administrative expenses						$ 1,300	900
Cash payments						1,300	$ 900
Amount due to related party					$ 0	$ 0
Board of Directors Chairman
Related Parties
Amount loaned or remitted to related parties		$ 1,800		$ 700
Principal amount of promissory note forgiven	$ 2,500
Interest on promissory note forgiven	100
Executive officer
Related Parties
Amount due from related party	200
Amount loaned or remitted to related parties			$ 200
Number of promissory notes | item			2
Number of restricted stock agreements | item			2
Interest income form related parties	$ 100