Stockholders' Equity - Warrants (Details)	Mar. 31, 2020 $ / shares
Common stock warrant (Series D-1)
Class of Warrant or Right [Roll Forward]
Exercise price per share (in dollars per share)	$ 5.54
Common stock warrants (Series F)
Class of Warrant or Right [Roll Forward]
Exercise price per share (in dollars per share)	9.22
Public Warrants (PHUNW)
Class of Warrant or Right [Roll Forward]
Exercise price per share (in dollars per share)	11.50
Private Placement Warrants
Class of Warrant or Right [Roll Forward]
Exercise price per share (in dollars per share)	11.50
Unit Purchase Option Warrants
Class of Warrant or Right [Roll Forward]
Exercise price per share (in dollars per share)	$ 11.50