Related-Party Transactions - (Tables)

12 Months Ended

Dec. 31, 2019

Related Party Transaction [Line Items]

Schedule of Related Party Transactions

	2019 Follow-On
Name	Shares of common stock purchased	Total purchase price
Timothy A. Springer, Ph.D.	4,000,000	$	6,000,000
Entities affiliated with Polaris	666,666	$	999,999
Chafen Lu (Timothy A. Springer’s wife)	66,666	$	99,999
Jed Springer (Timothy A. Springer’s brother)	1,000	$	1,500

December 2019 Financing

Related Party Transaction [Line Items]

Schedule of Related Party Transactions

	2019 Purchase Agreement
Name	Shares of common stock purchased	Common warrants to be purchased	Total aggregate purchase price
TAS Partners, LLC	3,940,887	1,970,443	$	6,000,000
Carrie S. Cox	65,681	32,840	$	99,999
Timothy Barabe	65,681	32,840	$	99,999
Scott D. Myers	39,409	19,704	$	60,000

Private Placement

Related Party Transaction [Line Items]

Schedule of Related Party Transactions

	2019 Private Placement
Name	Shares of common stock purchased	Total purchase price
Timothy A. Springer, Ph.D.	1,600,000	$	2,896,000
TAS Partners, LLC (affiliate of Timothy A. Springer, Ph.D.)	1,100,000	$	1,991,000
Elona Kogan, J.D.	82,872	$	149,998
Patrick Zenner	55,248	$	99,999
Takashi Kei Kishimoto, Ph.D.	50,000	$	90,500
Carsten Brunn, Ph.D.	41,436	$	74,999
Scott D. Myers	41,436	$	74,999
Stephen Smolinski	13,812	$	25,000