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Stockholders' Equity - Summary of Warrant Activity (Detail)	9 Months Ended
	Dec. 31, 2018 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance | shares	10,132,312
Granted, Options Outstanding | shares	8,024,194
Exercised, Options Outstanding | shares	(622,192)
Options Outstanding, Ending balance | shares	13,037,551
Weighted-Average Exercise Price, Options Beginning balance | $ / shares	$ 4.01
Granted, Weighted-Average Exercise Price | $ / shares	1.29
Exercised, Weighted-Average Exercise Price | $ / shares	0.08
Weighted-Average Exercise Price, Options Ending balance | $ / shares	$ 2.45
Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance | shares	220,000
Granted, Options Outstanding | shares	0
Exercised, Options Outstanding | shares	0
Cancelled, Options Outstanding | shares	(75,000)
Options Outstanding, Ending balance | shares	145,000
Weighted-Average Exercise Price, Options Beginning balance | $ / shares	$ 7.19
Granted, Weighted-Average Exercise Price | $ / shares	0
Exercised, Weighted-Average Exercise Price | $ / shares	0
Cancelled, Weighted-Average Exercise Price | $ / shares	7.36
Weighted-Average Exercise Price, Options Ending balance | $ / shares	$ 7.11

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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