Accounts Receivable, Net - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020
Receivables [Abstract]
Gross accounts receivable	$ 2,274	$ 2,575
Allowance for uncollectible accounts	(1,654)	(1,624)
Total accounts receivable, net	620	$ 951
Provision for doubtful accounts	$ 1,600