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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (16,523) $ (6,513)
Adjustments to reconcile net loss to net cash used in operating activities:    
Allowance for doubtful accounts and other (25) (32)
Provision for excess and obsolete inventories 327 260
Non-cash lease expense 458 462
Depreciation and amortization 962 1,079
Stock-based compensation 2,101 1,922
Amortization of premium (discount) on investments 49 (14)
Changes in assets and liabilities:    
Accounts receivable 2,343 1,973
Inventory (568) 904
Prepaid expenses and other assets (56) (1,064)
Accounts payable 1,238 (728)
Accrued expenses and other liabilities (1,693) 531
Net cash used in operating activities (11,387) (1,220)
Cash flows from investing activities:    
Purchase of investments (17,509) (15,866)
Maturities of short-term investments 17,250 18,626
Decrease in MikaMonu escrow deposit   1,000
Purchases of property and equipment (122) (265)
Net cash provided by (used in) investing activities (381) 3,495
Cash flows from financing activities:    
Payment of MikaMonu escrow deposit   (428)
Proceeds from issuance of common stock under employee stock plans 3,326 3,629
Net cash provided by financing activities 3,326 3,201
Net increase (decrease) in cash and cash equivalents (8,442) 5,476
Cash and cash equivalents at beginning of the period 51,506 42,495
Cash and cash equivalents at end of the period 43,064 47,971
Non-cash financing activities:    
Purchases of property and equipment through accounts payable and accruals 9 24
Operating lease right-of-use assets exchanged for lease obligations 658 1,228
Supplemental cash flow information:    
Net cash paid for income taxes $ 857 $ 310