Stockholders' Equity - Summary of Net Proceeds from Private Placement (Detail) - USD ($) $ in Thousands		12 Months Ended
	Dec. 24, 2019	Dec. 31, 2019
Class Of Warrant Or Right [Line Items]
Total Net Proceeds from Private Placement	$ 25,247	$ 25,247
Common Stock and Pre-Funded PIPE Warrants [Member]
Class Of Warrant Or Right [Line Items]
Total Net Proceeds from Private Placement	11,713
Milestone Warrants [Member]
Class Of Warrant Or Right [Line Items]
Total Net Proceeds from Private Placement	$ 13,534