Development Awards and Deferred Revenue (Tables)
|9 Months Ended|
Sep. 30, 2019
|Revenue from Contract with Customer [Abstract]|
|Schedule of Roll Forward Deferred Revenue||
A roll forward of deferred revenue related to the Investment Agreement for the nine months ended September 30, 2019 is presented below.
Tabular disclosure of contract balances and changes in contract balances.
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef