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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (2,372) $ (1,938)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation 258 242
Loss on disposal of property and equipment 0 11
Amortization of intangible assets 1,483 322
Amortization of premium on investments, net 0 27
Stock-based compensation 1,936 1,322
Change in fair value of contingent consideration 1,557 0
Deferred tax liability (2,291) (22)
Changes in operating assets and liabilities:    
Trade accounts receivable (5,735) 3,069
Inventory (1,861) 322
Prepaid expenses and other assets (265) 188
Other assets 48 0
Accounts payable 2,356 (1,576)
Accrued compensation (871) (845)
Accrued liabilities and other 217 168
Lease liabilities (39) 0
Net cash provided by (used in) operating activities (5,579) 1,290
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 15,899
Purchases of property and equipment (409) (349)
Net cash provided by (used in) investing activities (14,594) 14,798
Cash flows from financing activities:    
Repurchases of common stock 0 (608)
Proceeds from issuance of common stock, net 2,240 91
Net cash provided by (used in) financing activities 2,240 (517)
Net increase (decrease) in cash, cash equivalents and restricted cash (17,933) 15,571
Cash, cash equivalents, and restricted cash; beginning of period 38,348 13,197
Cash, cash equivalents, and restricted cash; end of period 20,415 28,768
Supplemental disclosure of cash flow information:    
Taxes paid 58 59
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 94 0
Cash and cash equivalents 20,240 28,593
Restricted cash included in other assets 175 175
Total cash, cash equivalents, and restricted cash $ 20,415 $ 28,768