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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 $ (1,542) $ (10,696)
Adjustments to reconcile net loss to net cash provided by operating activities    
Depreciation and amortization expense 3,544 3,696
Stock-based compensation expense 14,149 5,831
Impairment of internal-use software   173
Changes in assets and liabilities:    
Accounts receivable, net (1,350) 4,658
Related party accounts receivable (1,675) 492
Inventories (6,143) (3,054)
Prepaid expenses and other assets 47 4,019
Accounts payable 2,448 491
Accrued expenses and other liabilities 912 758
Lease liabilities   (713)
Net cash provided by operating activities 10,390 5,655
Cash flows from investing activities    
Purchase of property and equipment (11,388) (1,675)
Cash paid for intangibles (577) (1,206)
Net cash used in investing activities (11,965) (2,881)
Cash flows from financing activities    
Proceeds from public offering, net of underwriting discounts and commissions 181,928 46,116
Payments for offering costs (340) (327)
Tax withholding paid on behalf of employees for net share settlement   (3,495)
Proceeds from loans from financial institutions   35,000
Principal payments on loans to financial institutions   (41,000)
Net cash provided by financing activities 181,588 36,294
Net increase in cash and cash equivalents 180,013 39,068
Cash and cash equivalents    
Beginning of period 73,525 63,418
End of period 253,538 102,486
Supplemental disclosure of cash flow information    
Interest paid during the period   604
Income taxes paid 1 1
Supplemental disclosure of noncash flow information    
Unpaid property and equipment 1,644 1,279
Right-of-use assets acquired under operating leases $ 238 $ 300