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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income (loss) $ 237 $ (1,202)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation 131 122
Amortization of intangible assets 716 164
Amortization of premium (discounts) on investments, net 0 (7)
Stock-based compensation 928 668
Deferred tax liability 2,302 0
Changes in operating assets and liabilities:    
Trade accounts receivable (3,944) 640
Inventory (278) (197)
Prepaid expenses and other assets (451) 238
Other assets 27 0
Accounts payable 1,179 (291)
Accrued compensation (1,263) (1,356)
Accrued liabilities and other 527 (44)
Lease liabilities 17 0
Deferred obligation under operating lease 0 (45)
Net cash provided by operating activities (3,920) (902)
Cash flows from investing activities:    
Cash paid for acquisition, net of cash acquired 14,185 0
Purchases of available-for-sale securities 0 (752)
Maturities of available-for-sale securities 0 11,400
Purchases of property and equipment (61) (115)
Net cash provided by (used in) investing activities (14,246) 10,533
Cash flows from financing activities:    
Repurchases of common stock 0 (190)
Proceeds from issuance of common stock, net 1,451 70
Net cash provided by (used in) financing activities 1,451 (120)
Net increase (decrease) in cash, cash equivalents and restricted cash (16,715) 9,511
Cash, cash equivalents, and restricted cash; beginning of period 38,348 13,197
Cash, cash equivalents, and restricted cash; end of period 21,633 22,708
Supplemental disclosure of cash flow information:    
Taxes paid 38 22
Supplemental disclosure of non-cash investing and financing activities:    
Right-of-use assets recorded upon adoption of ASC 842 3,199 0
Leased liabilities recorded upon adoption of ASC 842 3,519 0
Accrual of property and equipment 13 21
Cash and cash equivalents 21,458 22,533
Restricted cash included in other assets 175 175
Total cash, cash equivalents, and restricted cash $ 21,633 $ 22,708