CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total
Beginning Balance - Shares at Mar. 31, 2021	24,020,276
Beginning Balance - Amount at Mar. 31, 2021	$ 24	$ 47,722	$ (20)	$ 27,866	$ 75,592
Issuance of common stock under employee stock option plans, shares	307,852
Issuance of common stock under employee stock option plans, amount		1,597			1,597
Stock-based compensation expense		1,539			1,539
Comprehensive loss:
Net loss				(8,776)	(8,776)
Net unrealized gain (loss) on available-for-sale investments			(31)		(31)
Ending Balance, Shares at Sep. 30, 2021	24,328,128
Ending Balance, Amount at Sep. 30, 2021	$ 24	50,858	(51)	19,090	69,921
Beginning Balance - Shares at Jun. 30, 2021	24,166,062
Beginning Balance - Amount at Jun. 30, 2021	$ 24	49,328	(35)	23,657	72,974
Issuance of common stock under employee stock option plans, shares	162,066
Issuance of common stock under employee stock option plans, amount		814			814
Stock-based compensation expense		716			716
Comprehensive loss:
Net loss				(4,567)	(4,567)
Net unrealized gain (loss) on available-for-sale investments			(16)		(16)
Ending Balance, Shares at Sep. 30, 2021	24,328,128
Ending Balance, Amount at Sep. 30, 2021	$ 24	50,858	(51)	19,090	69,921
Beginning Balance - Shares at Mar. 31, 2022	24,486,239
Beginning Balance - Amount at Mar. 31, 2022	$ 24	53,083	(154)	11,498	64,451
Issuance of common stock under employee stock option plans, shares	67,514
Issuance of common stock under employee stock option plans, amount	$ 1	178			179
Stock-based compensation expense		1,299			1,299
Comprehensive loss:
Net loss				(7,204)	(7,204)
Net unrealized gain (loss) on available-for-sale investments			(25)		(25)
Ending Balance, Shares at Sep. 30, 2022	24,553,753
Ending Balance, Amount at Sep. 30, 2022	$ 25	54,560	(179)	4,294	58,700
Beginning Balance - Shares at Jun. 30, 2022	24,553,753
Beginning Balance - Amount at Jun. 30, 2022	$ 25	53,899	(181)	7,522	61,265
Stock-based compensation expense		661			661
Comprehensive loss:
Net loss				(3,228)	(3,228)
Net unrealized gain (loss) on available-for-sale investments			2		2
Ending Balance, Shares at Sep. 30, 2022	24,553,753
Ending Balance, Amount at Sep. 30, 2022	$ 25	$ 54,560	$ (179)	$ 4,294	$ 58,700