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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities    
Net loss $ (2,266) $ (1,307)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 652 730
Net amortization of premiums and discounts on securities available-for-sale   (43)
Deferred income taxes (1,828) 979
Stock-based compensation expense 2,457 2,728
Changes in assets and liabilities:    
Accounts receivable 3,806 2,663
Net investment in leases (546) (735)
Inventories (3,479) (3,304)
Income taxes   (4,153)
Prepaid expenses and other assets 447 192
Right of use operating lease assets 49 151
Medicare accounts receivable, non-current (1,294) (973)
Accounts payable 5,022 4,741
Accrued payroll and related taxes (3,041) (1,804)
Accrued expenses and other liabilities (779) 1,044
Net cash (used in) provided by operating activities (800) 909
Cash flows from investing activities    
Proceeds from maturities of securities available-for-sale   10,000
Purchases of property and equipment (249) (358)
Intangible assets costs (62) (36)
Net (used in) provided by investing activities (311) 9,606
Cash flows from financing activities    
Taxes paid for net share settlement of performance and restricted stock units (1,115) (1,160)
Proceeds from exercise of common stock options 1,296 172
Net cash provided by (used in) financing activities 181 (988)
Net (decrease) increase in cash and cash equivalents (930) 9,527
Cash and cash equivalents - beginning of period 47,855  
Cash and cash equivalents - end of period 46,925 32,297
Supplemental cash flow disclosure    
Cash paid for taxes 13 311
Capital expenditures incurred but not yet paid $ 133 $ 155