Nature of the Business and Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands			3 Months Ended		12 Months Ended
	Mar. 02, 2020 Employee	Apr. 01, 2019 USD ($)	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares	Mar. 19, 2020 shares
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Employee workforce, termination percentage	60.00%		60.00%
Number of employees expected to be terminated | Employee	43
Common stock, Shares authorized			150,000,000		150,000,000
Common stock, Shares issued			30,821,892		30,663,054
Deficiency letter from listing qualifications department notifying period					30 days
Minimum bid price of common stock | $ / shares					$ 1.00
Initial period to regain compliance with minimum bid price rule					180 days
Additional period to regain compliance with minimum bid price rule					180 days
Net loss | $			$ (6,094)	$ (11,691)
Accumulated deficit | $			$ (129,986)		$ (123,892)
Cowen [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Shares of common stock issued and sold			0
Lincoln Park Capital Fund [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, Shares authorized						25,000,000
Common stock, Shares issued						726,382
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Proceeds from issuance of equity and debt financing | $		$ 150,000
Maximum [Member] | Cowen [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Stock offering cost | $		$ 50,000