Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
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	$ 2	39		41
Stock option exercises (in shares)	17
Issuance of shares pursuant to Employee Stock Purchase Plan	$ 4	161		165
Issuance of shares pursuant to Employee Stock Purchase Plan (in Shares)	36
Stock-based compensation		522		522
Net loss			(1,579)	(1,579)
Balance at Jun. 30, 2018	$ 3,324	140,444	(105,306)	38,462
Balance (in shares) at Jun. 30, 2018	33,239
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
Net loss				(2,920)
Balance at Sep. 30, 2018	$ 3,324	140,953	(106,647)	37,630
Balance (in shares) at Sep. 30, 2018	33,246
Balance at Jun. 30, 2018	$ 3,324	140,444	(105,306)	38,462
Balance (in shares) at Jun. 30, 2018	33,239
Increase (Decrease) in Stockholders' Equity
Stock option exercises		10		10
Stock option exercises (in shares)	5
Stock-based compensation		503		503
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes		(4)		(4)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)	2
Net loss			(1,341)	(1,341)
Balance at Sep. 30, 2018	$ 3,324	140,953	(106,647)	37,630
Balance (in shares) at Sep. 30, 2018	33,246
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	$ 1	13		$ 14
Stock option exercises (in shares)	10
Issuance of shares pursuant to Employee Stock Purchase Plan	$ 5	167		172
Issuance of shares pursuant to Employee Stock Purchase Plan (in Shares)	48
Stock-based compensation		602		602
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)	2
Issuance of common stock in connection with public offering	$ 618	26,133		26,751
Issuance of common stock in connection with public offering (in shares)	6,183
Net loss			(1,572)	(1,572)
Balance at Jun. 30, 2019	$ 3,962	169,175	(113,115)	60,022
Balance (in shares) at Jun. 30, 2019	39,620
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
Net loss				$ (3,759)
Balance at Sep. 30, 2019	$ 4,057	174,475	(115,302)	$ 63,230
Balance (in shares) at Sep. 30, 2019	40,571			40,571
Balance at Jun. 30, 2019	$ 3,962	169,175	(113,115)	$ 60,022
Balance (in shares) at Jun. 30, 2019	39,620
Increase (Decrease) in Stockholders' Equity
Stock option exercises	$ 2	65		67
Stock option exercises (in shares)	23
Stock-based compensation		793		793
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes	$ 6	(6)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)	59
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			(2,187)	(2,187)
Balance at Sep. 30, 2019	$ 4,057	$ 174,475	$ (115,302)	$ 63,230
Balance (in shares) at Sep. 30, 2019	40,571			40,571