Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (23,225)	$ (8,771)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,265	1,256
Impairment of long-lived assets	4,443
Loss on extinguishment of debt		1,343
Amortization of deferred financing costs	12	141
Stock-based compensation	1,352	782
Provision for inventory write-down	666	1,421
Allowance for doubtful accounts	14,805	24
Provision for sales returns	239	(231)
Provision for warranty	269
Unrealized gain on foreign currency transactions	(883)	(1,983)
Deferred taxes	(134)	(820)
Changes in operating assets and liabilities:
Accounts receivable	(1,423)	9,109
Inventories	(3,239)	14,129
Contract assets	(267)	(7,048)
Prepaid expenses and other assets	(3,864)	(3,285)
Accounts payable	3,539	(1,261)
Contract liabilities	32	(275)
Accrued and other liabilities	(523)	(3,937)
Net cash provided by (used in) operating activities	(6,936)	594
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,266)	(560)
Acquisition of business, net of cash acquired	(4,258)
Net cash used in investing activities	(5,524)	(560)
Cash flows from financing activities:
Proceeds from issuance of common stock in public offerings, net of issuance costs	59,525
Proceeds from short-term borrowings and line of credit		1,307
Repayments of short-term borrowings and line of credit	(11,494)	(4,167)
Repayments of long-term borrowings		(13,125)
Proceeds from related party term loan		18,361
Repayments of related party term loan	(29,298)
Proceeds from exercise of stock awards and employee stock plan purchases	2,569	709
Net cash provided by financing activities	21,302	3,085
Effect of exchange rate changes on cash, cash equivalents and restricted cash	404	(873)
Net increase in cash, cash equivalents and restricted cash	9,246	2,246
Cash, cash equivalents and restricted cash at beginning of period	54,587	33,635
Cash, cash equivalents and restricted cash at end of period	63,833	35,881
Reconciliation of cash, cash equivalents and restricted cash to statement of financial position
Cash and cash equivalents	56,818	26,437
Restricted cash	6,848	9,281
Long-term restricted cash	167	163
Cash, cash equivalents and restricted cash at end of period	63,833	35,881
Cash paid during the period for:
Interest - bank and trade facilities	83	424
Interest - related party	94	152
Income taxes	$ 1,206	$ 1,504