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Stub Period Comparative Data (Unaudited) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Total revenues	$ 8,634	$ 2,509	$ 7,210	$ 2,012	$ 2,442	$ 486	$ 715	$ 928	$ 933	$ 385	$ 2,928	$ 1,318	$ 20,365	$ 4,571	$ 2,961	$ 7,539
Operating expenses:
Research and development											10,412	8,088	15,368	18,502	16,178	14,880
Sales and marketing											8,174		29,772	9,658	1,512
General and administrative											8,901	5,044	17,939	15,430	11,545	11,235
Total operating expenses											27,487	13,132	68,226	43,590	29,235	26,115
Loss from operations	(8,985)	(14,060)	(10,165)	(14,651)	(11,005)	(13,554)	(9,782)	(4,678)	(5,808)	(6,006)	(24,559)	(11,814)	(47,861)	(39,019)	(26,274)	(18,576)
Interest and other income											367	49	1,054	420	101	91
Interest expense											(1,642)		(6,176)	(2,362)	(720)
Change in fair value of derivative liability											(18,886)			(45,164)	(26,278)
Net loss	$ (10,410)	$ (15,647)	$ (11,498)	$ (19,238)	$ (11,594)	$ (33,126)	$ (34,428)	$ (6,978)	$ (5,782)	$ (5,983)	$ (44,720)	$ (11,765)	$ (56,793)	$ (86,125)	$ (53,171)	$ (18,485)
Net loss per share - basic and diluted	$ (0.10)	$ (0.15)	$ (0.11)	$ (0.20)	$ (0.12)	$ (0.44)	$ (0.62)	$ (0.15)	$ (0.13)	$ (0.15)	$ (0.53)	$ (0.28)	$ (0.54)	$ (1.27)	$ (1.15)	$ (0.52)
Weighted average common shares - basic and diluted	106,680	106,938	106,238	95,452	94,494	75,170	55,387	45,644	44,530	39,430	85,057	41,980	104,307	67,942	46,226	35,344
Collaborative Research and Development [Member]
Revenues:
Total revenues												$ 601		$ 2,625
Royalty [Member]
Revenues:
Total revenues											$ 1,045	$ 717	$ 2,180	$ 1,946	$ 1,618	$ 970

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