CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (11,363)	$ (7,240)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	4,966	6,159
Non-cash operating lease cost	1,230	968
Stock-based compensation expense	10,129
Impairment of internal-use software	959
Changes in assets and liabilities:
Accounts receivable, net	435	1,908
Related party accounts receivable	335	573
Inventories	(3,481)	7,367
Prepaid expenses and other assets	2,625	(1,825)
Accounts payable	3,820	(621)
Accrued expenses and other liabilities	2,108	(1,489)
Lease liabilities	(1,921)	(918)
Net cash provided by operating activities	9,842	4,882
Cash flows from investing activities
Purchase of property and equipment	(3,912)	(832)
Cash paid for intangibles	(1,437)	(1,378)
Net cash used in investing activities	(5,349)	(2,210)
Cash flows from financing activities
Proceeds from public offering, net of underwriting discounts and commissions and other offering costs	45,789	(1,329)
Tax withholding paid on behalf of employees for net share settlement	(3,492)
Proceeds from loans from financial institutions	35,000
Principal payments on loans to financial institutions	(76,000)
Net cash provided by (used in) financing activities	1,297	(1,329)
Net increase in cash and cash equivalents	5,790	1,343
Cash and cash equivalents
Beginning of period	63,418	7,889
End of period	69,208	9,232
Supplemental disclosure of cash flow information
Interest paid during the period	799	1,258
Income taxes paid	1	1
Supplemental disclosure of noncash flow information
Unpaid property and equipment	420	120
Unpaid deferred offering costs		461
Right-of-use assets acquired under operating leases	$ 382	$ 10,763