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Quarterly Financial Data - Summary of Quarterly Results of Operations (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
Quarterly Financial Information Disclosure [Abstract]
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 loss	(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)
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

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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