Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Mar. 31, 2017	$ 3,249	$ 136,968	$ (99,993)	$ 40,224
Balance (in shares) at Mar. 31, 2017	32,488
Increase (Decrease) in Stockholders' Equity
Stock option exercises	$ 59	1,131		1,190
Stock option exercises (in shares)	591
Stock-based compensation		1,781		1,781
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes	$ 10	(158)		(148)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)	107
Net loss			(3,526)	(3,526)
Balance at Mar. 31, 2018	$ 3,318	139,722	(103,519)	39,521
Balance (in shares) at Mar. 31, 2018	33,186
Increase (Decrease) in Stockholders' Equity
Adoption of ASU 2014-09 (see Note 1)			(208)	(208)
Stock option exercises	$ 4	81		85
Stock option exercises (in shares)	43
Issuance of shares pursuant to Employee Stock Purchase Plan	$ 10	355		365
Issuance of shares pursuant to Employee Stock Purchase Plan (in Shares)	92
Stock-based compensation		2,156		2,156
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes	$ 6	(54)		(48)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)	56
Net loss			(7,816)	(7,816)
Balance at Mar. 31, 2019	$ 3,338	142,260	(111,543)	$ 34,055
Balance (in shares) at Mar. 31, 2019	33,377			33,377
Increase (Decrease) in Stockholders' Equity
Stock option exercises	$ 12	244		$ 256
Stock option exercises (in shares)	120
Issuance of shares pursuant to Employee Stock Purchase Plan	$ 9	361		370
Issuance of shares pursuant to Employee Stock Purchase Plan (in Shares)	91
Stock-based compensation		2,785		2,785
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes	$ 7	(22)		(15)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)	73
Issuance of common stock in connection with public offering, net of costs	$ 618	26,133		26,751
Issuance of common stock in connection with public offering (in shares)	6,183
Issuance of common stock in connection with acquisition	$ 87	4,448		4,535
Issuance of common stock in connection with acquisition (in shares)	869
Net loss			(5,610)	(5,610)
Balance at Mar. 31, 2020	$ 4,071	$ 176,209	$ (117,153)	$ 63,127
Balance (in shares) at Mar. 31, 2020	40,713			40,713