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 loss	$ (3,565)	$ (5,093)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	1,617	1,964
Stock-based compensation expense	6,660	2,755
Changes in assets and liabilities:
Accounts receivable, net	1,706	1,839
Related party accounts receivable	(240)	508
Inventories	(2,630)	(2,433)
Prepaid expenses and other assets	72	2,410
Accounts payable	1,748	371
Accrued expenses and other liabilities	734	476
Lease liabilities	(27)	(762)
Net cash provided by operating activities	6,075	2,035
Cash flows from investing activities
Purchase of property and equipment	(3,866)	(1,138)
Cash paid for intangibles	(370)	(279)
Net cash used in investing activities	(4,236)	(1,417)
Cash flows from financing activities
Proceeds from public offering, net of underwriting discounts and commissions	181,928
Payments for offering costs	(340)
Tax withholding paid on behalf of employees for net share settlement		(1,788)
Proceeds from loans from financial institutions		12,000
Principal payments on loans to financial institutions		(3,000)
Net cash provided by financing activities	181,588	7,212
Net increase in cash and cash equivalents	183,427	7,830
Cash and cash equivalents
Beginning of period	73,525	63,418
End of period	256,952	71,248
Supplemental disclosure of cash flow information
Interest paid during the period		46
Income taxes paid	1
Supplemental disclosure of noncash flow information
Unpaid property and equipment	1,436	153
Right-of-use assets acquired under operating leases	$ 322	$ 300