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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (13,357) $ (16,523)
Adjustments to reconcile net loss to net cash used in operating activities:    
Allowance for doubtful accounts and other (85) (25)
Provision for excess and obsolete inventories 330 327
Non-cash lease expense 291 458
Depreciation and amortization 752 962
Stock-based compensation 2,279 2,101
Amortization of premium on investments 59 49
Changes in assets and liabilities:    
Accounts receivable 702 2,343
Inventory (723) (568)
Prepaid expenses and other assets (870) (56)
Accounts payable 792 1,238
Accrued expenses and other liabilities (112) (1,693)
Net cash used in operating activities (9,942) (11,387)
Cash flows from investing activities:    
Purchase of investments (7,163) (17,509)
Maturities of short-term investments 7,384 17,250
Purchases of property and equipment (541) (122)
Net cash used in investing activities (320) (381)
Cash flows from financing activities:    
Proceeds from issuance of common stock under employee stock plans 2,353 3,326
Net cash provided by financing activities 2,353 3,326
Net decrease in cash and cash equivalents (7,909) (8,442)
Cash and cash equivalents at beginning of the period 44,234 51,506
Cash and cash equivalents at end of the period 36,325 43,064
Non-cash investing and financing activities:    
Purchases of property and equipment through accounts payable and accruals 26 9
Operating lease right-of-use assets exchanged for lease obligations 174 658
Supplemental cash flow information:    
Net cash paid for income taxes $ 54 $ 857